And that's why I switch to a sane language like python once my shell scripts get longer than a few lines.

But I would love a shell with a sane language. At the moment I am using zsh + oh-my-zsh because I can not let go of the autocompletion I get. I tried some other shells like oil shell, ion shell, nushell and elvish but sadly the completion is just not there yet. The only shell with maybe even better completions I came a cross is fish, but I don't love the language, while it seems better than sh/bash to me I'd much rather have something more similar to ion shell with stronger typing.

Thinking about command completion, this seems like the analog problem to editors and the language server protocol. Is there something like a command completion server?