It's replacing any previous web text editor UX components that we had in the past (likely DraftJS). We're also building Lexical for iOS which is slowly rolling out across iOS devices too.
It's 2022 and we're reinventing every wheel, but in the browser.
GitHub has a Markdown editor with a paste handler (converting tables and such). It once had a bug. I had to disable handlers in the browser to be able to paste.