If you haven’t yet used rust-analyzer, immediately go and try it out. The developer experience is much better than RLS, particularly for larger projects.
One question I’ve had for some time: what exactly is the relationship between Ferrous Systems and the Rust core team? The most important part of this article - the call for sponsors - calls out the former, but I would think Mozilla would also be greatly motivated to sponsor this work. (If they haven’t already?)
I'm using it (with https://github.com/joaotavora/eglot in Emacs) and it's fantastic.
I imagine that it's evolving quite quickly, and it's also the sort of thing where it's probably both fun and fine to stay close to the bleeding edge. Should I just periodically download the latest released binary, or is it worth building from master?