This could be pretty useful for regions that aren’t 1-1 matches with AWS. It wouldn’t surprise me if latency varies enough that from EWR, for instance, you sometimes connect to us-east-1 and sometimes connect to us-east-2.
We’ve been meaning to setup Smoke Ping so you can see latency like this but haven’t gotten it done yet: https://oss.oetiker.ch/smokeping/