Adding a particular use case here.
Trigger warning so adding a blur:
Sadly one of our forum members has been stalked, sexually abused and assaulted by someone who has just joined our forum.
They’ve used the ignore feature yet that isn’t enough of them to feel safe. They would like to know how they can feel safe by not allowing the bad actor to get “close” to them.
It would make absolute sense if one user could block another. So that the blocked user has no way of seeing/interacting with the other user.