I think their point was so that the fediverse people could also see Twitter posts and vice versa, which I guess some people would like, but some would block.

One of the complaints that people have about the Fedverse is that you're never exactly sure which instances interoperate with which other ones, and so somebody that other people are talking to might be blocked on your instance, and you might think, this fediverse sucks.

But honestly I think this is necessary for instance sovereignty and safety, so maybe people will get used to it.