I think it's really worth watching this Flipboard interview/podcast with Eugen Rochko, the creator of Mastodon.
https://flipboard.video/w/cTBu4HusskGTuPBahqm6WY
He sees it as a good thing, and I'm inclined to trust his judgement - it lets us share our ideals and culture with a broader audience, it lets us engage with a larger amount of content (if we want to), and we still have the power to block it at any point if we decide it's a bad thing. Pre-emptive defederation takes the power out of users hands, only grants more power to large silicon valley corporations, and is self-defeating if the goal is to try to move to a federated web.
Also, their federation is likely to have a near non-existent impact on aussie.zone, given we're a link-aggregation platform and not a microblog like Mastodon or Kbin.