It's a political debate between industry and 'the people' whether control over network utilization is exercised by components/bottom-up or endpoints/top-down.

both sides claim fairness/net-neutrality and performance on their side but one is deployed and working while the other one is standardized and looking for an application.

presumably there is room for a compromise but defining "queue building flow" w/o regard to link capacity seems like a step in the wrong direction