Defederation should honestly be saved for the worst of the worst. What beehaw has done just doesn't really make much sense. They're intentionally blocking themselves off from the rest of the fedi, and I don't think it's because of trolls/spam. It seems like any comments that don't fit the culture they want are seen as a reason to defederate.
I mean that's fine for them, they can stay in their bubble, but it means their users could potentially miss on a lot of content as well; it honestly hurts them more than the rest of us. And the longer they stay that way, the more they'll suffer, unfortunately.