I asked when it happened otherwise, you didn't answer.
Those moe boards area nonsense splurge by one guy, and the board themes aren't concrete. There is no community set up and then dropped.
/b/ doesn't get deleted, the BO changes and a bit of atmosphere shifts, but it doesn't change who goes there.
The boards are, by majority, incredibly stable. I really don't get where you're coming from.
And, still, I think we have a fundamentally different perspective. I like the feature of making boards and I like that boards can
be made with a limited scope that has a lot of enthusiasm early then explode when that initial momentum runs dry. It never goes stale that way.
This doesn't happen, you're mistaken. But if it did, I think that'd be fine.