Alright, I've been thinking. As we know, the default model of conversation on the Fediverse is a tree. Threads are directed graphs, each node is allowed multiple children and *only one* parent. Kinda like a filesystem. There are also (hash-)tags, but they are a bit meta and work across all conversations.
What if we upgrade it a little bit? What if we allow **multiple parents** to each node? What if you can reply to multiple posts? I miss this feature because sometimes, when I post something, I get similar replies from different people, and I'm forced to either answer both of them (which sucks, because duplication of effort) or reply to only one and leave all others unanswered, which spawns an offshoot conversation that is basically already over. This way, conversation may feel more like putting out little fires at times. So, instead I can just add all of those in one reply, and add more as they appear.
And it's not that hard to do. Just make in-reply-to a list, not a string.
@drq
This is a not so bad idea which will never be implemented.