Comment by hbn
I assume when they said that only most games are compatible, the exceptions would be the ones that require the OG Switch's physical hardware. From what I heard Ringfit and Labo were only compatible with the OG Switch (not even the existing Switch OLED) because they're designed to fit specifically with its design.
That would be pretty great if that's the only limitation.
Would be cool if you could still pair old gen controllers to the new switch for things like ring fit.