fish is not a POSIX shell so it doesn't pick up on rustup's modifications to your dotfiles. You'll need a fish enthusiast to help you. Maybe then you can submit a patch to rustup to support fish :D
It is utterly rediculous. Tumblr did it and basically died afaict, and now OnlyFans will die too (or at least become significantly less useful) - someone else will (hopefully) pick up the baton to allow these people to make a living.
As a code-reviewer I'd recommend replacing 'it is in' with 'containing' - i.e. "MapSection it is in is in view" becomes "containing MapSection is in view"
When I'm asking the coder a question, I direct it to them. "Why did you choose to do this in this way?" when I'm asking for changes I try and be passive "It would be better if ... " and when I'm talking about accomodations needed should merge happen, it's we/us.