Oh, I didn't mean to imply I was faulting Debian for this. It's more a matter of somewhat bad timing - they couldn't do it earlier with the Squeeze freeze, and since the release there's been quite a few transitions.
I was just wondering whether they could have instead jumped from 5.10 to 5.14 in one go (maybe ill-advised), or whether they could move quickly to 5.14 while everyone is still going through the motions of the 5.12 transition (probably makes little difference in amount of work).