Comment by Dylan16807

Without that reddit user saying what kind of UUID or how it was generated, that anecdote is nearly useless.

> Ultimately, we'd have to design the system to handle collision anyway.

It's possible for a bug to create a collision. But it's also possible for a bug to return someone else's ID at any point in the process. So even if you try to "handle" collisions, it might not work. You can't programmatically detect a mistake like that. Detection only works for bugs in a narrow slice of the pipeline. And extra complication in the pipeline, especially with a code path that has never been taken before, adds its own risk and drops the trustworthiness of the entire system.

> Might as well design a system to avoid collision in the first place.

Agreed. But UUID accomplishes the goal of "designed to avoid collisions" by itself.