>The most rational path for them is to just assign addresses from a big pool and not bother with the all the fancy subnetting.
That's what he's suggesting, though (I think). Except because it's IPv6, Amazon's big pool of addresses would never conflict with Facebook's big pool of addresses.
One thing that may not have come across in the post is that one of the reasons we moved into VPC first is that Direct Connect is basically just a big dump pipe to AWS without VPC in place. Without VPC, there's no way to advertise routes for just your instances or to ensure that only traffic to/from your instances goes across the Direct Connect.
That's what he's suggesting, though (I think). Except because it's IPv6, Amazon's big pool of addresses would never conflict with Facebook's big pool of addresses.