Yeah they had a problem where the amortized ID rate was less than the number of valid UUIDs you could generate in a given time interval, but with a peak rate well above that, so UUIDs weren't quite going to function for naming/numbering them. You gotta be pushing a lot of messages through a system to hit that, but it's possible. And adding more layers of coordination on top of something meant to reduce coordination overhead tends to... make things messy.
I've half-heartedly tried to look up his problem every time I've had to introduce UUIDs to something (most recently fixing agents not generating correlation IDs), and I have not figured out which version of UUID he was talking about. I now suspect it was some proprietary or industry-specific quote-unquote UUID spec rather than an industry wide one. I may look through the UUID7 spec at some point to see if they mention prior art. Much more plausible than him being a time traveler.
I've half-heartedly tried to look up his problem every time I've had to introduce UUIDs to something (most recently fixing agents not generating correlation IDs), and I have not figured out which version of UUID he was talking about. I now suspect it was some proprietary or industry-specific quote-unquote UUID spec rather than an industry wide one. I may look through the UUID7 spec at some point to see if they mention prior art. Much more plausible than him being a time traveler.