In my experience, the old tools are generally rock solid and are still viable—deps.edn is where a lot of the momentum is going, but Leiningen still works as well as ever. I haven't actually tried to create a new project from an old template recently, but projects I created with old template still run fine.

The big exception is ClojureScript. I haven't personally noticed bitrot as much as ClojureScript being generally flaky. I think the situation is improving, though, and the unreliability is mostly in compilation and hot-reloading, not at runtime.

I think Clojure could use more funding to improve tooling, but I do think we have made strides with the funding we have.