If the majority of users on Lemmy.world does not want to be federated with meta then Lemmy.world will lose those users and then no longer be the power they currently are with influence over the fediverse.
Also I believe it’s disingenuous to equate explodingheads, which was defederated for being extremely toxic due to its lack of moderation and meta which presumably has more resources to devote to moderation than any fedi instance (of course they are still terrible at it)
I’m for defederating with meta when the time comes because I don’t think that their influence is healthy for the fediverse and don’t think that most admins could handle the burdens that would come with federating with them. Lemmy.world (and mastodon.social and a few others) is a big enough instance that they could handle those challenges. I’ve said before that if meta only sticks to the open source AP spec then the risks are much less and so that should be the criteria for federation