My only issue with Fish is when pasting things from the web that assume Bash, a lot of the time it just works, then now and then I get screwed. I don't know nearly enough Fish or Bash to switch. Still though, I prefer Fish ultimately.
I use zsh with plugins which pretty much makes it act like fish's convenience but one can use fish as their shell scripting while keeping the "bash" compatibility by keep using zsh or bash under terminal.