As another rant: we old farts know which window manager we want to use. But for newer users, there might be a chance to find something cool before they get totally fossilized.
And secondary rant: X is a failure, in that there is a *choice* of window managers, but so many of them haven't been really upgraded and thus are "useless" because they don't support modern hints. It looks like a very interesting line to die on.