The list of hot questions doesn't include our beloved meta. My question is, why?
I think the visitors of stackexchange.com would be interested in changes and other discussion regarding the community they are using. Or, better put, the chance of them being interested is certainly higher than the chance they are interested in a SE website that can be about anything, from cooking to AI to music.
Obviously I'm only talking about this meta, the "central meta". Adding the metas of all the other sites would only create noise because they'll only talk about one specific website, not the entire network, so the likelihood of the user being interested is extremely small.