I think this is not just a problem with ecosystems, but a consequence of the language design itself. Zig and Nim have extensive meta programming language facili

I think this is not just a problem with ecosystems, but a consequence of the language design itself. Zig and Nim have extensive meta programming language facilities that making good autocompletion support is a very hard problem, while Java doesn't have such a complicated language design. (The problem with Java though is that it's instead hard to use without an IDE since there's too much boilerplate because of its spartan design).