the switch to dot aws is meant to long-term decouple aws api endpoints from a domain that is also used for a bunch of other stuff, like marketing websites and d

the switch to dot aws is meant to long-term decouple aws api endpoints from a domain that is also used for a bunch of other stuff, like marketing websites and docs. of course, like all aws things they have no consistency over adoption. as for using a different hostname for dual stack, the reasoning is that they cannot guarantee that all clients of a given service will handle dual stack dns correctly (ex NAT filtering, IAM policies, &c). so they opt to give clients explicit control over migrating to dual stack.