Postgres UUIDv7 and per-back end monotonicity

What is a v7 UUID. Why do we need more than 1. uuid from a random seed and 2. one derived from that and a timestamp (orderable)

I didn't downvote you, but the terseness made it for me immediately come off as a kind of criticism, e.g.: "Why would we ever need it". May not have been your intent but if it was a genuine question, form matters.

Be kind. Don't be snarky. Converse curiously; don't cross-examine. Edit out swipes.

Comments should get more thoughtful and substantive, not less, as a topic gets more divisive.

When disagreeing, please reply to the argument instead of calling names. "That is idiotic; 1 + 1 is 2, not 3" can be shortened to "1 + 1 is 2, not 3."

Please don't fulminate. Please don't sneer, including at the rest of the community.

Please respond to the strongest plausible interpretation of what someone says, not a weaker one that's easier to criticize. Assume good faith.