Google seems to dislike sharding because its an end run around CWND and congestion control. In an uncongested network sharding works great. Once it starts to

Google seems to dislike sharding because its an end run around CWND and congestion control. In an uncongested network sharding works great. Once it starts to become congested sharding works against you. The priority system and single persistent TCP connection is there to make it suck the least for everyone.