[throwaway74432]

It's a security vs convenience tradeoff. For most people, making the ID practically unguessable, while also preserving index locality in databases, is the right balance.

[beejiu]

> making the ID practically unguessable

80 bits of randomness is just on the edge of unguessable, though. Most people accept that 128+ bits is cryptographically secure now and in the future.