I say this as an avid emacs user: Emacs has a real problem in that it's very powerful but the, let's say, spiritual leader of the project (Stallman) is so wildly divorced from the real world because of his personal choices that he really has no idea what makes a compelling UX vs what makes a complete mess of arcane incantations. On top of that, the documentation is only suitable as a reference for someone who already knows emacs, so it's hard to learn.
To wit: Again I really really like Emacs as a piece of software, and I've been using it for like 10 years now. Maybe 3 or 4 of those years I've been using it reasonably seriously and even I find my eyes glaze over because of how dense and unapproachable the documentation is.
On top of that, being a political project, Stallman actively resists certain improvements to Emacs that would for example make it work better on my Mac, because my Mac is nonfree and Stallman would rather have an objectively poorer piece of software than one that "encourages" using MacOS.
And of course the other senior people in the Emacs project don't want to go against Stallman, so emacs is doomed to being a mediocre niche text editor with unrealized potential to become a household name.
If someone wrote an open source clone of Emacs that adopted some sane defaults, modern UI conventions, and dropped all the political BS it could be so much better.
Alas I don't have the skill nor the time to attempt such a thing.
Edit: hey how about a substantive reply rather than drive-by downvotes?