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TCP_NOTSENT_LOWAT is very convenient as it indicates when to report EAGAIN on the sending side. It takes a margin on top of the estimated window, meaning that it's no longer needed to store too many data in socket buffers. Instead there's just enough to fill the send window and a little bit of margin to cover the scheduling time to restart sending. Experiments on a 100ms network have shown a 10-fold reduction in the memory used by socket buffers by just setting this value to tune.bufsize, without noticing any performance degradation. Theoretically the responsiveness on multiplexed protocols such as H2 should also be improved.
