That’s really bizarre. A lot of rhythm games have a calibration test you can do for both visual and audio lag, the visual lag test would be a great way to get some time measurements of the lag with different controller types.
Edit: Rift of the Necrodancer has a free demo that includes a visual latency test.
Unfortunately Deck 2 timing is unknown right right now, haven’t had any leaks suggesting that we’ll be getting it soon. We know Valve is releasing SteamOS for more devices, starting with Lenovo handhelds, but it’s not clear if we’ll see SteamOS for any non-handhelds in the immediate future.
We are getting a new Steam Controller soon, which I’m hyped about.