We’ve seen this question asked all over the internet, and since Nintendo thinks silence is a viable answer to mass confusion (work it out for yourself, guv), we thought we’d chime in.
The simple answer is yes, they do. That includes all original Joy-Cons, the Pro Controller 1 itself, as well as the GameCube adapter.
Switch 1 controllers can be used wirelessly and are also compatible with Switch 2 exclusive games, but they can’t be used if a game requires features unique to the Joy-Con 2 (such as mouse controls).
In short, if you don’t want to buy additional controllers, your old ones will work fine in almost all scenarios. The Switch 2 comes with two Joy-Con 2 controllers included.

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