OK, cool. So the answer is no then? you didn’t really answer.

At some point you are relying on someone not fucking up something somewhere. At the very least you need your ISP not fucking up your connection speed or something similar.

I’m not saying that xmpp sucks or that they are right on saying that there are not alternatives (although I am inclined to agree). What I’m saying is that your server is not a reference point to compare against, because you operate at immensely different scales and requirements