jwz writes up some Mastodon’ts. The big one is to give the original post (OP) control over replies in the thread. So an OP is more like a blog.
I initially thought this was a bad idea, but yeah, if you’re doing a In Reply To, you shouldn’t get to ride along the OP reach. https://www.jwz.org/blog/2023/08/mastodons-mastodonts/