This is an awful explanation based on flawed resolution concepts. PS4 doesn't have the power to do much better than PS3 visuals at 1440p, never mind 2160p(4K). Also, PS3 also ran games at 1080p, and, funnily enough, the original Xbox ran one game at 1080i(a Matrix game) and a few at 720p(with PS2-comparable visuals), while GT4 also ran at 1080i on the PS2.