@sweet_peony @TerminalAutism @ArdainianRight Because the OS you're using takes up resources too, and the emulator maker can't make a 1:1 product unless the entire official codebase of both the hardware and firmware and drivers and software and so on one day would leak out.
Or the official emulators would get reverse engineered into being able to play commercial ROMs, because Nintendo/Soyny/SEGA/Atari/whateverelse used to release official emulators to 3rd party developers in the past.