Earlier quoted context omitted.
Emacs isn't the best code editor. It isn't the best note taker. It isn't the best document writer. It isn't even a good lisp. What is Emacs the best at these days?
Why are you asking the person who said Emacs isn't the best at any particular thing? If you want to engage, at least read the comments.
Because it's the question that I'm interested in. I use Emacs still because it's astoundingly mediocre at all things that I use it for; but always mediocre and never terrible. I would like to know if there's something it's the best at, besides being predictably mediocre.