So, how do you guys use UUIDs for real? I worked in a company in which they were using UUIDs in Mongo, and of the most painful things were implementing API endpoints that filter resources. Imagine you have an endpoint in which you are filtering by resources A, B, C and D. Ideally you would end up with something like this:

    GET /filter?a_id=X&b_id=Y&c_id=Z&d_id=w

But in practice we were using POST and passing the ids in the body payload. Why Because my old team said "the UUIDs are long, so we may reach the maximum URL length if we pass them as parameters". I didn't like it, and I still don't like it at all.