Emacs is getting a lot of attention in this post. I think it’s
because it was the first IDE (or one of the first),
It isn’t just that. Emacs over the years has had support added for pretty much every text editing need a person could possibly have. That’s a lot of functionality.
Nobody who sets out to create an editor from scratch (not even Microsoft) can possibly produce all that functionality when they are done. So the absolute best any other editor can shoot for is implementing a subset of Emacs. Some parts of that subset they may manage to implement a bit better, but it will still just be a subset.
Its true that occasionally these alternate editors do something new. However, any new functionality someone may come up with can just as easily be added to Emacs. If its useful, it will be done by someone. If its really useful, it will get moved into the default codebase.
So there’s really not much point in anyone ever creating their own editor. I’m not upset that some people still have the hubris to do it, as the competition ends up making Emacs better. But that’s all it is doing.