Let them ignore... Those players are mostly young and without having much dedication to something which has a great gameplay/functionality. Those people have a low attention span and shift a lot in their desires (essentially describing puberty here). High quality looks are not thát important. If you want a comparison, the big simrace leader Iracing is also still on DX9. Moving up to more advanced graphical technics is only worth it if you can put a dedicated graphics programmer on it. So much which deserves improvement, graphics are not that important, it's nice when some easy made improvements can be created though. Make up on a woman, it looks a bit better but it's still the same woman.