Edit: This is in response to @benhoyt two comments back. Struggling to format it correctly on my phone.
I think the confusion comes from what human intervention means. I think people see that and think, the charm can’t recover automatically, so therefore a human needs to debug the issue, thus blocked state.
My understanding is that it is not actually for the situation above, but for a situation where the charm can tell the human what needs to be done. Do you agree?