You can and databases do. What people want is for it to be sortable by generation time, i.e., they want it to share the "larger values were generated later" pr

You can and databases do. What people want is for it to be sortable by generation time, i.e., they want it to share the "larger values were generated later" property of timestamps (but without collisions) or SERIALs (but without the locking on the serial / independent generation).