I think of it as more important when email is being used as an announcement medium - I'm ok leaving a mistake/sending a correction to one or two people, but not 1100.
If "undo send" gives a psych boost to being obsessive-compulsive, this still doesn't address the additional layer of possible failure. You have better control over your ability to not hit "Send" then you do to do a panic cancel as you do a last second proofread.
You're trying to cram everyone's problem into the same box, it's silly.
There's plenty of reasons you might undo an email if you had the chance.
Taking a 10-minute break is not something I've ever done before I sent an email.