I agree with some of the stuff here. GT PSP is a car collecting game, not a full blown GT game. It's easy to forget because it looks and handles so nice.
PD obviously made some deliberate choices to put certain things in and leave other things out. If I recall correctly (according to interviews anyway
), it was really difficult for PD to make it run at 60FPS and keep it under 1GB of space.
I have many, many racing games for PSP, including several NFS games (including Shift), TDU and several Burnout games. None of them come even close to how GT PSP looks, I am amazed by how beautiful it is every time I play it. Just do a comparison using chase cam and it becomes quite obvious.
As for unnecessary stuff: Personally, I think the duplicates would be a good way to cut space....but we don't know if for instance the Opel/Vauxhall or Renault/Lutecia are actually completely different models/textures or just the same models/textures reused (in which case removing them wouldn't free up a whole lot of space). Same for all the variations of Japanese cars. Also, for a mobile game, cut all the car descriptions; I didn't miss them in Prologue and I wouldn't miss them in GT PSP.
I think the amount of tracks is fine, but we know there is more in there, but it's simply not shown. So it's already eating up space, why not enable it by default? But what I really miss are proper tuning options. Again, we know the parameters are there, but they can't be changed without CFW.