As long as this site doesn't implement the ActivityPub protocol, I don't see any reason for me to move to this site. I don't have time to maintain another account, and I want to keep in touch with people from Mastodon and Threads.
This feels like a very 2010s comment, when it was assumed that one has to be on every single social network app, copy/pasting the same 'content' into each of them, in order to be visible online. All that did was turn the net into a giant monoculture of hot takes and too-short posts. Only influencers and shovel-sellers need that.
I think it's more about the network effect: the point of social networks is to talk with your friends, so you want to be on a network your friends are on.