Unfortunately I can't take credit [0], and I think I originally heard this term from a military friend. But it stuck with me, and it has definitely improved my communications.
And I wholly agree re: the last paragraph. It's surprising how often the last thing in a very long missive turns out to be a perfect summary/BLUF.
Thanks for giving a good name to a piece of advice I frequently repeat.
Often it can be as simple as cut-pasting the last paragraph of an email to the top.