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EDIT: Sure wish I could delete this post.

Wait, this isn't TCP, this is protocol level above TCP, right? TCP doesn't shape traffic by itself through rate limiting and congestion analysis, does it? I thought the layer above it used TCP to send/receive the buffer size, and that has nothing to do with TCP.

Am I wrong?

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TCP definitely does congestion control itself: https://en.wikipedia.org/wiki/TCP_congestion_control

You are wrong! Obviously the application layer on top of TCP could be the bottleneck, but TCP itself has mechanisms to ensure traffic is flowing as fast and as smoothly as possible. Look up "TCP Flow control" and "TCP Congestion Control"

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