There are perfectly fine and compatible CPU-based renderers for Playstation 1 in Mednafen or pSX. People don't want compatibility, though, they want their graphics to be better than the original.
So emulator devs make these GPU-based HLE renderers that are always going to be hacky no matter what.
So emulator devs make these GPU-based HLE renderers that are always going to be hacky no matter what.