If I have to open a terminal just to get up and running, the UI has failed. If something that basic has failed, there are other much larger problems to deal with still. None of which I want to deal with.
Also I’ve spent 40 years working in various versions of dos and PowerShell interfaces, and there’s enough difference with all nix type interfaces that I don’t want to deal with swapping back and forth. I do that enough with the programming languages I use every day that it’s a constant annoyance.