Sorry to spoil the party pooping, but the lag shown here in OoT and Mario 64 really doesn’t look like a dealbreaker to me. People were making similar videos on the Switch version of Hollow Knight and the game played perfectly fine - heck, the lag shown in those videos looked even worse iirc. Sure, if you’re used to speed running on original hardware then yeah, I bet it feels sluggier, but really doesn’t look as bad as this person wants to make it look.
Online lag is clearly awful though, no question.
BTW, the “people with shitty Internet” comment is... legit? The code clearly needs more work, but I’ve had online Switch sessions with Smash, etc that were flawless and others where it all crawled down to 5fps or so. That’s not “defending” the service, ffs.