This is not a "feature," this new prompt. It is an annoyance.
How do I disable it. I use Vive's OpenXR, for one because I run DCS Standalone and thus can save a bit of system resources on not running Steam at all. Other reasons as well.
Nuf said is that I don't want to use SteamVR's OpenXR. So stop trying to make me FFS. Seriously.