So much discussion about "racing game" vs "car collecting game"... This is no different than real life. I've run across several types of car people IRL. IMO, there are some general flavors of car people, some people fit more than one, and this list is in no way comprehensive:
modders: like to modify their cars outward appearance to make it look fast, and they may drive aggressively on the street but never race their cars. It's all about looking good/cool/mean/masculine/feminine/tough - or whatever. ...remember spinners?...
collectors: like to buy pristine cars, keep them in pristine condition, wash them often, detail the interior often, detail the engine bay. They know a lot about their cars history, and like to educate others on the subject. Often found at car shows and enjoy taking pictures of cars
builders: like to take a car as a platform, develop parts or buy proven parts to improve the car's performance. They often develop their passion into a business to help others build their cars. These guys are different from modders in this way: they will actually test the performance of their cars and quantitatively check that the parts they changed/tuned actually improve performance on autox, track, drifting or racing.
street racers: think public streets are no different than a race track without recognizing the safety aspects of a race track (controlled environment, corner workers, flags, etc ) - I've no respect for a street racer's lack of respect for the public's safety.
drifters: like showy driving and the satisfaction of developing the skills to control their car at >30 degrees slip angle. They often partner with builders to mod their cars.
drivers: like to develop skills to make them faster in autox or track. These guys/gals focus on improving their driving skills and measure their progress through competitions in a safe environment.
racers: focus on winning at the race track. These guys spend some serious $$$ on consumables such as tires, brakes, race gas, etc, and on maintenance including engine/transmission rebuilds, shock rebuilds, etc. You know you found one if they have spare engines, transmissions, shocks, diffs, etc.
Personally I started as a collector and moved to the "driver" category with a brief stint as a racer on the go-kart track even as I was autocrossing cars.
Conclusion - there are different types of car people and it is just fine for each person to determine what brings them satisfaction within the car culture community. The GT series does a pretty good job of appealing to most of the categories above with the exception of street racers - who might gravitate to GTA. I think GT7 will expand its appeal relative to GTS which was more focused on racers and drivers, with some attention to collectors and drifters. Find the game that brings you the most satisfaction to your preferred car culture flavor.