The keyboard passthrough works good enough, in Horizon Workspaces. It's completely usable for me. As far as I know, they haven't opened it up the ability to do passthrough to other developers yet, which is unfortunate since I much prefer Immersed. So, this is also my biggest problem with it, so much so, that I'm trying to transition to a CharaChorder keyboard, where the concept of looking at the keys doesn't really exist.