The benchmarks test something very specific: A ton of tiny requests on keepalive connections. Those tiny requests are not very IO efficient, and therefore 10GBi

The benchmarks test something very specific: A ton of tiny requests on keepalive connections. Those tiny requests are not very IO efficient, and therefore 10GBit/s is already a lot. However if you would add a benchmarks to download 10MB static files the network utilization would likely go a lot up - even if the same frameworks are used.