It sounds like you have never worked on a platform frequented by mobs of abusers (situations where abuse is targeted and high-volume enough that the "victim should just block" alternative is untenable for the victim).

Or a platform used by children.

The alternative, which you're welcome to use, is a fully decentralized/unmoderated platform. That alternative doesn't work for a lot of people. For them, the ability to report is often critical, quite literally, for their physical safety.