Most emulators have just been built/developed with what people are used to, or what they like, which has become more similar over the years. Your questions confuses me a bit, but if you are actually looking for a good front-end for your standalone emulators, try emudeck:
https://www.emudeck.com/
Most emulators have just been built/developed with what people are used to, or what they like, which has become more similar over the years. Your questions confuses me a bit, but if you are actually looking for a good front-end for your standalone emulators, try emudeck: https://www.emudeck.com/