1: Introduce an actual search system for liveries. They seem to be going somewhat there with share codes for liveries, but this isn't enough, and it never will be. It amazes me that Forza had a system, up to FM4/FH1, of having a decent search system, and most importantly, the ability to search for liveries on a vehicle by most downloaded / highest rated and then a T10/PG Selects category. This has bothered me ever since I started playing Forza full time with FH3 - and it's simple **** that needs to be done. As a matter of fact, I'm pretty certain that the only reason why they changed it to this labyrinthine system we have currently was to shift the livery economy so that livery creators could get more out of potential profits since they removed the ability to set prices for liveries. Considering the entire economy since FH3 has basically been upended by how they give you cars to sell both as duplicates and in the Auction House like candy, and subsequently hand out Wheelspin bonuses (especially with Super Wheelspins) it makes me wonder why we can't just have the system from FM4/FH1, and what the point of the system is now.
2: When music gets disabled in game, it gets disabled. Period. There is absolutely no reason to have music being played in loading screens specifically (and at a pretty decent volume too!) when you have the radio set to off by default, and music volume in game set to 0. I'm fine with it being ambient noise in the environment, but this has been present since launch for FH4, and it was never patched out. What worries me, and it should worry Playground, is that with places like Youtube and especially Twitch cracking down on copyrighted music being used (to hilariously draconian efforts on Twitch's side) there is going to be a lot of egg on the faces of streamers, and should absolutely be on the face of Playground, when FH5 drops and streamers find themselves getting copyright strikes by Twitch because Playground couldn't be arsed to make music be turned off during loading screens when they go in first off and turn music down to zero in the audio settings.
3: Splitting Euro Ford/Aussie Ford from American Ford, and the same with Aussie Chrysler and American Chrysler has already been mentioned, so I'll bring up another one: re-classify the Modern Muscle class specifically. When I think of a muscle car, I think of stuff like the Challenger, the Mustang and the Camaro. What I don't think of is the two V Caddies (which should probably be in Super Saloons) the C7 Z06 and C6 ZR1 (Modern Super Cars) and probably the 2020 GT500. Likewise, the C5 Z06 and the Viper GTS ACR probably don't belong in Retro Muscle either, considering they both were considered sports cars by the time they were released. It seems to me like Forza splits up the classes based upon country of origin - which in most cases, works, but in others, as mentioned, it leads to vehicles being poorly classified, put into categories they really don't deserve to be.
4: Cutting down on the bloat that is tuner/custom vehicles that would be better served as body kits for the specific vehicles they are based around then having them as their own vehicles. The Emory 356 RSR and RWB 911 are perfect examples, and as much as I could probably accept them being separate vehicles, the Deberti pre-runners could absolutely be applied to the stock versions of their separate vehicles already in game and made as bodykits. By this point, NFS has had these extreme versions offered as bodykits
since 2015, so why can't Forza? It just doesn't make sense to prop up the car list with these vehicles that basically could be better served as upgrade branches to the vehicles they're based on, and it would serve as a good way to make the Upgrade Heroes more significant. But I doubt this gets done for FH5, and seems more like something that gets explored for FH6, and presumably be better served with the games running on all next-gen hardware.
5: If not simply running off your systems internal clock, then having analog and digital clocks in cockpit views run on in game time (albeit spread up) It seems strange to have clocks be stuck at 12:00, when it's the setting sun.
6: Make custom paintjobs, and nothing more, be their own separate category from user created (and indeed, user downloaded) liveries. The ability to name them would be nice too, considering that for some vehicles, using the handy paint list posted on the Horizon boards over the years, would help to not make the livery catalog feel so cluttered.
7: Having specific models show up so that 5 of the 12 in the field are driving the same car (with maybe one having an actual livery on it) is eliminated. I can imagine that this would happen when you have a short field of vehicles, but it's quite silly to have a Forzathon championship, and like four of the field are in the exact same car.
8: Since it's mentioned already, I will re-iterate: Allow for users to upload their own decals. If you are worried about offensive content, hire a moderation team and actually follow up on reports and you won't have many problems. Likewise, allow for users to edit liveries as they see fit. Again, NFS has had the ability to do this since 2015, and from what I see, it seems to simply save edited liveries to the user, and doesn't allow them to be re-uploaded. The one trump card that Forza had over GT, for close to a decade, has been beaten. If they are waiting for Horizon 6 to add this feature, then they are not reading the room, and are simply allowing for the complaints to fester. There is absolutely no reason for livery editors to continue manipulating basic shapes and have liveries that give off an where they look good, but don't look exact, when they could very easily upload a PNG and make the process not only faster, but easier as well.
9: Related to the above, but there is no need for liveries to be pixelated when looking at close-up angles, which happens an awful lot in FH4. It's embarrassing to look at vehicles at such a close angle in pause screens, establishing shots at the beginning of the pre-race, and in the menus of races and stories, and see liveries pixelate like no tomorrow. Especially when it was possible on Xbox One X and PC versions of Forza 7 to have liveries in clear, HD quality. Hell, GT Sport does the same on base PS4. Do better.
10: An actual request and not a jokey one: set a universal limit for auction house buy out and opening bid price commensurate to the vehicle's rarity. The Legendary level vehicles probably deserve a 20 million credit buy out and high opening bids, a Mercedes X-Class does not, when the latter's rarity is only tied up in it being a Forzathon vehicle. Likewise, remove the ability for legendary painters to set high prices to begin with - since it's very obvious to me that 95% of legendary painters only get to that status because it allows them the ability to set the prices and hang everyone else over the barrel to either pay up, or hopefully find a vehicle in the many menus that isn't like priced at that level, which some guy probably will snipe under your feet anyway.