> My mental model for UUIDv7 is that it’s a mash-up of a bunch of different ideas which implementations are free to choose as they see fit. There’s a wide variance of properties that UUIDv7 implementations can provide, with varying degrees of certainty they can successfully provide those properties.

I think this is good. A proper UUID that has specific significant bits dedicated to (approximately) monotonic values is useful. I don't want it over-specified beyond that, and I don't want to just use UUIDv8.

You probably don't need a UUID: https://ssg.dev/you-probably-dont-need-a-uuid/