I totally get that but I want to grow Lemmy and want users to join Lemmy. They won’t if they could just subscribe to our communities. Plus I don’t want threads to benefit from my content if I post to instances federating with Threads

They will federate with Threads. If I continue posting on lemmy.world, Threads will benefit from it and Threads users would never join Lemmy because they could subscribe to our communities. But I also don’t want to split my niche communities

What if I don’t want to post on lemmy.world anymore, because I don’t want Threads to benefit from my posts/comments.

I want people to come to Lemmy for its contents. Why would Threads users join Lemmy if they can subscribe to our communities instead?

Not sure when accounts were redesigned but in my version (0.1.0 11) Accounts now show a list of accounts, whats the current account and Add button on top, not inside any account settings (it was before)

I believe eventually we would be able to move, set defaults, etc. the dev team is probably working on more important matters right now