I have the same problem: I tried in 2020 to play the games of my childhood (Super Mario Bros 3 being a favourite) on an emulator, and I keep dying in the early, easy, levels. I'm 30 years older than when I first played the game, am I that much worse? Maybe.
NES platformers rely on precise timing, and the controls just _feel_ sluggish and laggy. I can absolutely believe that some combination of delays introduced by the bluetooth stack for the controller, the OS' input event queue, the emulator itself, and the whole modern video pipeline add up to a few frames worth of delay compared to the original game drawing itself on a CRT.
NES platformers rely on precise timing, and the controls just _feel_ sluggish and laggy. I can absolutely believe that some combination of delays introduced by the bluetooth stack for the controller, the OS' input event queue, the emulator itself, and the whole modern video pipeline add up to a few frames worth of delay compared to the original game drawing itself on a CRT.