Emacs is an ethereal substance. You cannot "use" it. Just like with magic - there are no users of Emacs, you can be skilled practitioner or a beginner but you don't "use" magic - you apply it to create or to destroy. To slay dragons, to amaze and terrify uninitiated ones
https://twitter.com/iLemming/status/1093349152199630848
Seriously though, Emacs is hard. Especially these days, when the constant flow of distractions is intense. People these days do not have the patience for learning anything that takes them longer than an hour to grok. They'd rather duct tape things with "left-pad" solutions and call it "it just works"™, and if [insert fav editor here] doesn't support something, they lose any incentive to even try things.