Let's assume GPU X supports some feature that GPU Y does not. Then you either use an (say OpenGL or Vulkan) extension to use it to squeeze out performance (lock-in) or you eschew the lock-in, don't use the feature and ignore the performance advantage. Now multiply this with lots of features and also consider that the graphic APIs of consoles offer some rather unique features that don't map directly to, say, DirectX11 or OpenGL.