This LSP performs reasonably well and having used it I'm not sure it's fair to call it "experimental". There's certainly some room for improvement in the code (e.g. diagnostics don't seem to run consistently with every change was the big one for me).

The greatest barrier I had with it was the installation.

I know about it but that's only part of the problem, afaik you can't use breakpoint in Guile and dependency management is still non existent.