Uhh just re-read what you said breadfan. A player does not host a game under the current bnet system, bnets dedicated servers do. So you're changing from two clients connecting to bnets servers to a host / client arrangement. Happy to be corrected otherwise with a source?
I only have empirical evidence, I don't think Blizzard go publishing their infrastructure plans - have you got a source yourself? it seems clear that someone is a host of a match. Next time you see Spartaz online, ask him to host (which is an option you choose at custom game menus) a series of matches with 3 obs and witness his lag (he gets a horrible connection to SEA). Then play a series with him not hosting but in the game and witness the difference. It is clear when in this situation with people who lag out as hosts that the act of 'hosting' puts additional demands on their connection. Sure I may be wrong but what I have said seems the most plausible based on the evidence I have at hand. Would be interested to know if you base it on the same?
Even the smallest donations help keep sc2sea running! All donations go towards helping our site run including our monthly server hosting fees and sc2sea sponsored community tournaments we host. Find out more here.