There are limits to this, as with everything. No one is going to make their emulator 3x slower to properly emulate one glitchy line in Super Mario Bros. that shows up on 1/3 of powerons based on a random clock alignment issue.
Besides that, the real console hardware could vary more between revisions than the difference between a console and an accurate emulator, so you also have to ask whose real thing is being emulated? Even with Nintendo's attention to detail on lot check, some real Game Boys won't play Prehistorik Man. There are some NES accuracy tests out there that require making your emulator behave like one specific console owned by blargg.
> No one is going to make their emulator 3x slower to properly emulate one glitchy line in Super Mario Bros. that shows up on 1/3 of powerons based on a random clock alignment issue.
Besides that, the real console hardware could vary more between revisions than the difference between a console and an accurate emulator, so you also have to ask whose real thing is being emulated? Even with Nintendo's attention to detail on lot check, some real Game Boys won't play Prehistorik Man. There are some NES accuracy tests out there that require making your emulator behave like one specific console owned by blargg.