Unless you want content and more people to interact with.
Like, people keep saying “oh yeah you can jump instances” as if that wasn’t possible on Reddit. You could go to different subs or make your own. But what good were most of them? As long as there’s a “default”, a main “hub”, people will go there, and that’s where everything will be happening. The alternatives and smaller instances will be starved out.
Centralization is not about the software, it’s about the people. Users centralize where others are. So when the big hubs are allowing threads to poison the well, it’s poisoning the thing most people want to drink from, and the thing new visitors will be most likely to drink from.
Threads represents something that a lot of people came to the fetiverse to escape. If threads wants to join, fine, but I believe it is in the best interest of all of us if there is a large alternative “cluster” that is separate from it rather than being tied up with it.
A separate galaxy in the fediverse, that says in big red neon lights, “Get your corporate bullshit away from us. This is our space, for people, not for you to make money.” And if we let them in immediately, it becomes increasingly difficult for that galaxy to retain that identity.
And I’ll just gently point out that once Threads joins, separating from it will not be easy because you will have Threads users here actively pushing back on the separation.