No. A game being about driving, doesn't force you to model some random car off the street. Because you can have everyday cars, that have quite a bit of performance in them.
A Golf GTI, is an everyday car, that has a sports pedegree to it, and more importantly, good enough performance to be driven around a track (which is what the game has, not an open world map like GTA).
So, for that "everyday car" category, they can get away with modeling sporty versions of road going vehicles, like GTI and R variants from VW, RS/ST from Ford, OPC from Opel, M from BMW, AMG from Mercedes, RS/S models from Audi, and so on. There's no reason to have the basic model.
Another thing that past GT games did great, that PD fully ignores now, was having lesser known brands. Saleen, Holden/HSV, FPV/Ford Australia, Tommy Kayra, Cizeta, Spiker, Autobacs, and many others. This was far more interesting than having some random SUV from Toyota.
Also, atleast for GT4, we had a decently up-to-date car list, without online updates! Nowadays, every brand is severely outdated in their line up, in all categories, road or race cars.