>why you'd do either instead of just serial/bigserial, which has always been my goto. Did I miss something? So the common response is sequential ID crawling by

>why you'd do either instead of just serial/bigserial, which has always been my goto. Did I miss something? So the common response is sequential ID crawling by bad actors. UUIDs are generally un-guessable and you can throw them into slop DBs like Mongo or storage like S3 as primary identifiers without worrying about permissions or having a clever interested party pwn your whole database. A common case of security through obscurity.