I totally love fish, it's the first shell that made me replace bash as my default shell (zsh was "just not enough" to justify losing compatibility, for me).

But is this project really overlapping it? I see mostly fish as "UX" centered, while oilshell - as far as it's stated here - reminds me more of powershell (I found the idea of having a modern language behind it so cool when it was released, too bad it wasn't my ecosystem): looks like oilshell is targetting scripting more than UX.

Anyway, I love the idea of having several shells who try to have a new look on what a shell is.

EDIT: oh, btw, let's not consider no significant scripting can be done with bash, just look at the incredible work from dokku team ;) https://github.com/dokku/dokku