Making a similar analysis to our friend "Apocalipse211", for me it would be the following:
*Most complete simulator: Assetto Corsa (we can drive practically any car, from any category, in any era of motorsport), even with the minor problems mentioned.
*Best F1 game: of the modern era, I also agree with F1 2020 (it was also the last one with classic cars), but in my point of view (who knows, maybe in the near future), an official game with all seasons (or that would be added over time), even with licensing problems (driver, car, circuits, something similar to AMS 2).
*Best Rally Game: from what I've always read, it was or is "Richard Burns", but I believe Assetto Rally (could replace it soon), Dirt Rally 2 (almost complete), EA WRC (could be "the game") but it was a disappointment for me. I still partly prefer (WRC Generations), to fill the gap (diversity of cars/stages), we fall back on Assetto Corsa.
*Most Revolutionary Simulator: certainly the series by "Geoff Crammond" is still glorified.I remember very well when we did championships/races (me, my brothers and some friends), in the famous "hot seat" mode... which was also present in some rally simulators, but never in other games that followed (they emphasized the online mode)... but the "hot seat" mode was quite interesting.
Nowadays what we do (are "time trials" modes)... usually at my house (... the pressure of trying to find a fast lap), knowing that the opponents are behind your chair (cheering? for you to crash into the wall)....
*Worst GUI/menus: without a doubt, this award goes to Rfactor 2, even though it's a very good simulator.
*Race Room: very good (with frequent improvements and updates), new packs are offered regularly (but few participate) when compared to other simulators.
*Automobilista 2: For me, we could say it's Project Cars 2 (of the modern era). A multitude of content could still be included. In my opinion, the versions of the classic tracks are unbeatable.
*Assetto Corsa Competizione: has always been a game (that requires a lot of hardware to run minimally) somewhat similar in this respect to Le Mans Ultimate (in my case, I can play much better).
*Best online simulator: from what they always say, iRacing has a guaranteed spot, but it's not for my "pocket, $$$$".
Result: To take the place of ASSETTO CORSA, it will be very difficult in the coming years, only if something similar happens with Assetto Evo (migrating the official and mod content to that title).