Earlier quoted context omitted.
Granted, it depends on how it turns out. But my first impression is that authoritative reference documents of MDN are going to become cluttered with comments and disagreements.
MDN has never been "authoritative reference documents". It's a wiki. Anybody can edit and republish pages, change examples, do whatever. I noticed somewhere about a year ago that it was a wiki, and have made minor changes to a couple of pages since then, when something was missing an example or something. I change, I publish, it's done. And if my change was wrong, or opinionated, or bad, it's just like that until som…
Every recent review I've seen of Wikipedia vs arbitrary big-a Authoritative sources has said that both have issues and overall Wikipedia is better.