It seems like a bug in the middlebox if it requires all end points to cooperate and doesn't throttle anyone. I thought the point of congestion control was to s

It seems like a bug in the middlebox if it requires all end points to cooperate and doesn't throttle anyone. I thought the point of congestion control was to slow down pointless sending when an overloaded middle box is dropping our packets and saying "buddy take the hint", not to actually yield to other traffic? The network tells us how much capacity we have, trying to push more would just increase our own stream's packet loss. ... Right?