If you look at the infographic Nintendo released about Switch games that work on Switch 2, WarioWare: Move It! is seen among the games. That game utilizes the IR sensor at some points, meaning that games that use the feature aren't wholesale cut from Switch 2 compatibility.
I guess you could make the case of, "Oh, Nintendo could release an update to prevent those IR sensor uses from coming up," but that's pretty clunky and not Nintendo's style. Occam's razor here, I think; as in, the solution that requires the least amount of assumptions is correct. It's likely that, yeah, stuff like Labo that require an OG Joy-Con size-wise won't work.
Thoughts? Apologies if this has been discussed already!
Source:
Mario Wiki extracted the image from the Nintendo Switch 2 website: https://www.nintendo.com/successor/en-us/index.html
However, to see the infographic without anything obfuscating it, Mario Wiki showed it here: https://www.mariowiki.com/File:Switch_2_backwards_compatible_games.png#mw-jump-to-license
by Traveler-of-Stars