Who autocompletes flags? Even as a Fish user, I'm stuck with not-Fish often enough that I can't afford to let it become part of my muscle memory.

Before you say "Bash can autocomplete flags" I don't think I've ever encountered a single third-party shell command that actually packages proper completions.

(Some Rust commands that use `clap` for argument parsing do something to install completions after the first run, but in my experience this is not particularly reliable)