This would be fine if it were obvious to all of us that GUIs have advanced as far as they can, and the remainder of the problems we see in them were inherent to the complexity and nondeterministic nature of the systems they manage.

But it's not like that. My IDE occasionally gets confused and forgets how to rename a file. Eclipse takes 3 minutes to refresh a source-file tree. People still use vim and emacs for things! There could be no clearer sign to me that IDEs are rubbish pieces of software than the fact that people keep falling back on tools that have barely evolved in 30 years.