I tried to use it for admin in a Windows environment, but half the modules I needed wouldn't work in Linux which made it pretty much useless.

I dont use powershell.
I use ZSH on My Gaming PC cause its POSIX and and has autocorrect and auto complete also with CachyOS They replicate fish features.
I use the Default good'ol bash on my Laptop running Debian that's on Life support because I dont care.
I tried Fish but didnt like the no POSIX compliance(ik they wanna fix POSIX but its annoying)

nushell is pretty cool

What's wrong with bash? Something missing or not to your liking? It can be configured

i just wish bash had structured data and basic types, that's it

I do, but only for work. There are certain tasks you can't do easily with just api calls.

I use fish via konsole however I still use bash as my login shell for stability reasons.

I use zsh on my work computers and fish on my desktop. Zsh is still POSIX compatible so is more bash-like. Fish is nice. When I use bash or zsh I want to use oh-my-zsh but with fish I haven't found myself wanting anything extra like that.

I use xonsh.