How are integers simpler? Even generation of unique integers is more complicated, let alone migrating them or moving them around.

1. You have to handle race conditions if there is ever more than one process writing to the DB at one time 2. It’s ambiguous whether a number is an ID. E.g. when looking at logs 3. Numbers leak information about table size, row age, and crucially future row IDs.

Nothing? Really? Have you ever thought about that?