Exactly. I prefer Emacs–style programs where the number of features grows without end, and everyone customizes the UI and keybindings to make the features they like best easiest to use. Every time someone thinks of a new way that Emacs can make their life easier they can add it to Emacs immediately, without asking for permission or even sending in a pull request. Later, if they think the feature is polished enough and others might find it useful, they can send a pull request either to Emacs or to the Emacs Lisp Package Archive (ELPA), or to MELPA (should they not like the minor licensing restrictions on ELPA), or just post it on EmacsWiki or their blog or Facebook page or whatever for others to copy from.

But for that to work you have to start with something that is both very extensible, and yet is also coherently designed. The extensibility has to be a strong part of that initial design, so that the software is designed to be malleable.