To implement a thread-safe sequential increment, you need locking. When you use locking, then it becomes a “non-universal” ID generator with arbitrary performance impact.

Either it’s collision-prone or locking. Both are problematic in their own way.

It’s footguns all over while UUIDv7 simply exists.

There is practically no need to have a thread-safe ULID generator that would be shared across threads/processes/hosts - a non-scenario that I cannot envision occurring in practice.