> most people on Twitter aren't writing Tweets

I don't know how true this is. Most people in my corner of twitter tweet several times a day, some of them have rapid-fire conversations in the replies. And that cache-busts (or at least appends to) a whole lot of people's feeds, just like it would people's chat history (while in both cases, almost all writes are appends)

But idk, I'll stop speculating here because I'm not basing it on much