I understand the appeal from AWS's perspective. Customer A pays for a 32 vCPU VM, which they run on 32-core hardware. Then they can also squeeze in customer B's 1 vCPU instance running a blog, and no one notices. Free money!

But I don't want to be either of those customers. It means the whole system has an extra layer of abstraction, so they can juggle VMs around. It's why you need slow EBS instead of just getting a flash drive in the same case as the CPU, with 0.01x the latency.