@Clackable@tldr.nettime.org
I don't think those things are irrelevant; if the OP is on my server, then the original post will be on my server, and when I look at the reply, my server will show it to me. If the person replying to it is on my server, then again the post will be on my server (because the replier saw it, so it must be here), and once again I'll see it. The reply is only "orphaned" if the reply is on my server (so I see it) but the OP isn't (because the original poster isn't, and no one who follows them is either).

But sure. :) Thanks to you as well, for helping my understand all of this better.