I play retro games regularly, and as good as emulation is, there are tons of old fast paced games that are unplayable for me on modern TVs due to input lag.
Recently was playing Zelda 1 on the NES when the game crashed and deleted my save half way through the 2nd quest. Tried to play it on an emulator and on the switch, and both felt clunky compared to playing on the NES. Could probably get through it, but it wouldn't have been fun.
FWIW, these days display lag/input lag on good gaming monitors/TVs is well under 15ms, which is the point at which some people can notice it. ("Good" is anything <25ms.) https://displaylag.com/display-database/
Recently was playing Zelda 1 on the NES when the game crashed and deleted my save half way through the 2nd quest. Tried to play it on an emulator and on the switch, and both felt clunky compared to playing on the NES. Could probably get through it, but it wouldn't have been fun.