Lowest-latency Ethernet: Byte-oriented NICs? (deleted from StackOverflow...)

Back in 2017 I had a kinda esoteric question about Ethernet NICs with less-than-frame latency, based on my experience with networking software and hardware, and the evidence for something "atypical" being in use by High Frequency Traders. So I posted my question to Stack Overflow.The question got a lot of pushback, which I found bizarre. It had to be moved across 3 SO sites... and finally it