Going a bit offtopic here but I've noticed a growing group of Gran Turismo fans who only cares about modern GT3 cars and nothing else. No other race cars (especially the classic ones), no road cars, just Gr.3 cars and (maybe Gr.4s?).
Even during GT Sport days, i felt like people still cared about having a variety of cars. What happened? Did the esport focus make a shift in playerbase interests? I know the developers are somewhat neglecting adding modern race cars into GT7 but I don't see anyone complaining about not adding Le Man Hypercars or stockcars for example. It's only just GT3s they talk about.
Anyways, i like that they added the Twingo into the game. I also hope that's a RUF rather than just a "regular" Porsche. As for that fast EV car, i don't realy have interests in modern super/hyper cars even from legacy brands, let alone an EV from a newer brand. That said, at least it's better than yet another crossover like the other updates.
This is only my opinion, but non racecars just feel completely lost in the mix and inconsequential in GT7.
There just isn't much to do in the game with non racecars. If they're lucky, a newly added road car will feature in an online time trial or a Daily Race A for a week or two, and then the game just seemingly never acknowledges their existence again. Sure, they can be used for World Circuit races in single player, but those are just a chore of navigating moving chicanes at best and an absolute farce at worst. I don't even think PD are trying to hide the fact that
the AI opponents in these races are well over the PP limits of the events in which they serve as opponents, necessitating players to cheese these "races" as well.
Which brings me neatly into my next point: the PP system is hilariously broken. I get that no rating system can perfectly balance a wide variety of vehicles across a variety of tracks, but I think
the PP system of GT7 has been deeply flawed since launch and PD has just silently given up on it. The
recent online time trial at Trial Mountain with the Toyota Crown is a solid example: the Safety Car with a limited slip diff was clearly faster than the base car with an open diff, and yet the base car has a higher PP rating than the Safety Car. When people can somehow cheese the system to get a Tomahawk under 600PP to grind Tokyo, you know the system's a joke. Granted, PD have patched some exploits, but some weird oddities still remain with ballast positionings and downforce that can give drastically different PP ratings for miniscule changes. Tuning a car then, just becomes a chore of trial and error as you literally test out every single available ballast position to test for a weird kink in the rating system, and then create a horrifically understeery car with min downforce front and max downforce rear to minimise the PP rating of the car and squeeze the most power out of it, which will be faster most of the time as I don't think GT7 has enough small and tight tracks to make handling worth it. All of that to lose to a swapped Cappuccino because PD can't be bothered to fix the PP system anymore. And if they DO fix it, then it invalidates every second of setting up players have done prior, deincentivising them from tuning again because who knows when the next PP revision will hit? All that is not to mention that the tuning system seems deliberately designed to be inconvenient; no way to share tunes directly, some semi–permanent mods that cost
more than the price of the car to revert, and straight up perma mods like wide body and engine swaps to make the necessary process of trial and error a needlessly expensive one. None of it is what I'd describe as "fun".

Don't get me wrong; despite all my whining, I'm having the most fun in the game right now with road cars in Spec Racing Club's Coffee Break events, in which there are power, mass, PP, tyre, drivetrain, and car category limits, and it's absurd fun to see the wildly different solutions people can come up with to solve the same problem. It's through these races that I'm forced to look at cars in the game I'd never have bat an eye at prior, and it makes me appreciate the sheer variety of cars already in the game. But it takes a lot of effort, thought, and just a straight up honour system in a community to make it all work, making it difficult to enjoy road cars in sporadic races with strangers in either sport mode or lobbies.
With race cars, there almost always isn't a concern for setups, since they're locked most of the time. You just jump in and go, and I think that plays so much to the strength of Gran Turismo: that anyone with a controller can just jump into a car and go. And if there is a car that's been shown to be dominant, then BoP can change to shake up the field. I think the reason why GT3 cars are so highly requested is because that seems to be the only category PD seems to give a damn about; every other category with their absurd mix of drivetrains, body shapes, and gearboxes is just impossible to balance against each other, especially with dynamic weather involved.
I think if the PP system was much better at accurately reflecting a car's capabilities, if road cars and open settings races were more prominent in sport mode, and if the open lobby netcode wasn't dog diarrhoea, that we'd see a lot more appreciation for even ostensibly boring road cars like the Twingo.
TL;DR I think the reason why people care so much about GT3 cars is because PD themselves seem to only care about Gr.3.