Linux

I think users are increasingly mouse-centric so the ability to is the mouse I think is a plus, as long as it's all still just as accessible to a keyboard-centric workflow.

But I think making the shell more interactive and adding more affordances is broadly a good thing and is really the important part, regardless of whether the user can navigate more with the mouse. The shell doesn't need to be a magic black box you speak the arcane language into and hope you got it right

Anything that helps better communicate to the user what you can do and how to do it would make the terminal way more accessible, which would be a boon for linux where you still sometimes come across things that don't have a good graphical path to completion, or even just one that's easy enough to find and follow.

Fish makes a lot of improvements (and it's a lot more Unix compliant than it used to be, to my understanding, but that's still its biggest downside) but I think more affordances and interactivity for the shell is awesome, even for users who appreciate the efficiency of a keyboard-centric workflow :)