BlueSky has broken social media assumptions in a key way that is impossible to ignore. The typical 90% lurkers, 9% commenters, 1% posters isn't holding over there. There's a much higher ratio of posters and people interacting. Their 1% is closer to 30%. That's astronomical.
In that way, it's not a Twitter replacement. It's something different. I won't say "new," because those engagement ratios are closer to "old internet," and what I think Mastodon could be one day.