First off, Mario 3D World and Toad Treasure Tracker. Nothing substantial, the game uses right stick, it is unnecessary to use gyro. Microphone is required for "blow" action, but I read that it hasn't been implemented in Vanilla yet.
However, I tried Lego City Undercover, and the scanner feature is completely unusable. I don't know how exactly the gamepad tracks the TV (the only camera is in the front, so it must be gryo or accelerometer?), but this cannot simply be worked around with either stick and cannot be skipped. (FYI, sans cutscenes, the feature is shown very early on in the game.)
I haven't extensively tested the Wii U library yet, but I'm afraid this is a pattern for many Wii U games, especially early titles.

In order to be more specific, I am testing this on my Steam Deck OLED running CachyOS Handheld. As far as Steam integration goes, it appears to faithfully re-create SteamOS' environment in regards to the separation between "desktop" and "game" mode, i.e. it has a login manager that can load into either of the two exclusive environments.
On desktop mode, I was unable to use the Steam Deck's internal controller or a DualShock 3. I couldn't use the former because the "Connecting to [console name]" screen is immediately cancelled in case I switch the Steam Deck gamepad profile to "gamepad" (long press hamburger button). Even if I use "desktop" profile, gryo does not work.
In game mode however, I had perfect input but no gyro (presumably because Steam Input doesn't let games use gryo directly unless they implement Steam Input API).
I should also mention there is an apparent difference on Steam Deck in regards to Steam running in "desktop" mode or not, it appears that the gamepad appears differently to games if Steam isn't running. Regardless, neither seemed to work.
What can I try? I am getting a bit desperate at this point, even though I am well aware the project is far from finished.