I think that is also due to a form of lock-in. Emacs and Vim are so different from anything else, and you invest so much time customizing and tailoring them to

I think that is also due to a form of lock-in. Emacs and Vim are so different from anything else, and you invest so much time customizing and tailoring them to your use that in the end they are actually your own editor, not Emacs or Vim anymore. Other editors instead are usually based on the same general idea and interaction, so switching and trying different ones is easier.