The UA might be the ultimate authority on what gets presented to the user and what doesn't, but, for better or for worse, the policy has been "draw everything"

The UA might be the ultimate authority on what gets presented to the user and what doesn't, but, for better or for worse, the policy has been "draw everything" since forever. Given a change in policy that explicitly avoids drawing some specific things, it's fair to call it "blocking" those things.