In my years as a dev I haven't found many true dependencies on Bash/Zsh. For Ruby, rbenv and other solutions worked. For Python, there was virtualfish to make virtualenvs work properly. Although now pyenv works out of the box with Fish. Other than that, simply adding a shebang to scripts is sufficient.

That being said, I don't go and convert the shell of all my AWS instances to Fish. I just keep my local shell as Fish.

I've been using fish for years now and cannot remember the last time something broke because it required bash but was run by fish.

One thing I do differently than most is I don't make fish my system-wide default shell. I leave that as whatever the system default is. Instead I just make fish the default shell within the terminal emulator I use.

Never had an issue with it, and it is much easier to setup as well.

Yeah, I think people miss that you don't have to `chsh` your shell. Perfectly fine to make your terminal launch `fish` instead of the default shell.

Pretty easy to drop into bash for a second to copy paste something from the internet and introduce God-knows-what onto your system. ;)

You can also set Fish to start up after bashrc (or whatever), so that you don't have to translate all your startup stuff.