Perhaps an overlooked aspect of Emacs that makes it so attractive is for those of us with some kind of RSI or other accessibility issue that makes customizability a must. I'll admit, I haven't used other editors all that much, but Emacs' keyboard-first approach makes it a much easier tool for me to use than other editors that require some kind of mouse interaction for certain aspects. I've been able to customize Emacs to have more ergonomic keybindings (e.g. I use evil-mode and evil-leader for a lot of common-use functions) and my RSI has never been better!

Granted, some of that RSI was due to how I had Emacs set up before. Not all of it, mind you, just some. I have repented of my non-ergonomic ways.