What's really weird is that TCP is an endpoint protocol and should have been relatively easier to upgrade/replace/change (relative to say, IP protocol).
But why haven't we moved to something better?
Say, why doesn't Apple use a better suited protocol between Apple devices and Apple servers? Why doesn't google use a better protocol between Google devices and Google servers (oh wait, they do – QUIC..which is something-other-than-TCP over IP).
More people should be doing this, yes? why not?
It is as if the layered architecture of the network isn't being taken advantage of by engineers.
As people build 4G-5G networks that are IP based, shouldn't we insist they build purely IP based and not peek into layers above and make assumptions? thereby enable more of the flow control and reliable transmission protocol experimentations?