It's hard to measure, so nobody does.
Throughput is easy to measure, so everybody does.
Latency is hard to buy, so few people try.
Throughput is easy to buy, so everybody does.
Latency is what matters to every user.
Throughput matters only to a few people.
Turn on SR-IOV. Disable ACPI C-states. Stop tunnelling internal traffic through virtual firewalls. Use binary protocols instead of JSON over HTTPS.
I've seen just those alone improve end-user experience tenfold.