Feels like you are missing the point a little bit. LSP is a human facing tool, so providing a good user experience should be the ultimate goal of it. What you described, feels to me, is not quite aligned with this goal.

Of course, since you describe RA as "explicitly an experimental project to prototype the right architecture for an IDE", all that doesn't matter and you can set the project's goal to be whatever you want. However, it just sucks for us, the users, because RA is the only thing we have. I'm just glad to see someone else is trying to do something different. And may the best project win.