Fish is also not POSIX which has always been its, and my, issue. I use zsh+starship and my own very minimal init stuff+zsh autocomplete and syntaxhighlihg plugins. It’s not a perfect setup. I wish fish would “just work” but it doesn’t. Frequently I had to look up for “workarounds” for my setup. 25 years in, I think I got it and i just keep my zshrc and `machine-init.sh` on point for my-own-style-experience. I think a lot of that could be simplified with fish+starship, but it’s just not there.

Yeah. I used zsh for decades, invested a reasonable amount of emotion and time in my config but swapped to fish last year as a sort of January trial and it stuck.

It's not perfect, the lack of HEREDOCs are annoying sometimes, and no background-able blocks (eg `{x}&`) means you can't async things as easily in scripts.

Zsh has a lot of advanced stuff (at least for a shell) that can deliver pretty complex scripting such as throw/catching, mountains of variable flags and switches which I do miss when I write fish scripts but really -- I've abused them a lot over the years and now days I would be more likely to just use a "builds to a single binary" language.

I will probably swap to nushell when it gets a bit more stable (in my experience it's runtime is stable, but it's feature set / command names are still shaking out. I really like it's general ideas though in terms operating on structured data.

Also, you probably don’t need to customize it at all, it’s more than good enough out of the box.