Checking for collisions becomes hardly possible in distributed systems pretty quickly (take git as an extreme example), and provides virtually no benefit if you

Checking for collisions becomes hardly possible in distributed systems pretty quickly (take git as an extreme example), and provides virtually no benefit if you can trust your RNG. At those astronomical possibilities, there are many things that can go wrong before collisions become viable. Think about it: Why bother checking, when you have a somewhat similarly egregious probability that a random bit flip occurs right after your check? In the situations you encountered, it's probably simple and cheap, but in the cases where it's not (the situation in the article being a probable example), it can be expensive, error-prone complexity without gain.