One of my pet peeves is that I think Linux users are disproportionately obsessed with the command line. A well designed GUI can actually be really powerful, but it seems like we compare well-designed CLIs to badly designed GUIs, decide that CLIs are amazing and keep not bothering to write good GUI apps.

That's not to say that CLIs aren't powerful - I have a terminal open all the time, and for many things it's the quickest option. But I think we underestimate how useful GUIs can be.