The main selling point for ZSH, for me at least, isn't the shell itself; it's the plugin ecosystem. Zplugin[0] allows me to load plugins and programs in the background without slowing down startup time, and makes it easy to carry programs across SSH sessions. Fish simply doesn't have replacements for many of my favorite plugins[1].

[0]: https://github.com/zdharma/zplugin

[1]: https://gitlab.com/Seirdy/dotfiles/blob/master/.config/shell...

Would you please list some other things that you are not going to do?

We don't care