The headline Performance numbers better speak for "when not to use sharding" use case. 40K QPS is trivial for even medium size MySQL Deployments with high end

The headline Performance numbers better speak for "when not to use sharding" use case. 40K QPS is trivial for even medium size MySQL Deployments with high end servers being able to handle 1M QPS (simple queries) 20Bil rows is also quite trivial - with 100 Bytes rows this will be just 2TB of data. We probably look at long rows in this case and complicated queries but as they read numbers are rather unimpressive :)