When I posted this, I linked to the latest statement https://github.com/mozilla/standards-positions/issues/1213#i..., which is the content relevant to the title (the details of our opposition to the API). Unfortunately someone removed the link to the specific post.
^ didnt realize who posted the opposition - this is Jake Archibald, a longtime googler on the Chrome team, now joining Mozilla and posting opposition to the Chrome API. no wonder the criticism is so well argued. most be a relief to not have to toe the party line on this one.