UPDATE (2018-05-17): This was fixed in SteamVR beta today, SteamVR Beta Updated (1526522336). Kudos to Valve for fixing this so quickly.
... because it will crash Holodance on startup. This does not happen with the current default (non-beta) SteamVR branch. I'm filing this with Valve and will try to come up with a workaround. The crash does not happen immediately but during initialization, so we're probably calling something in OpenVR that worked before, and now no longer works. Other games may or may not be effected depending on whether or not they call that broken function (I don't know which one it is, yet).
I also pinned this in the forum.