The rewrite sounds good to me. Just one possible improvement. I work almost exclusively with VM for testing so iso size doesn't matter. Should it be an alpha requirement that the isos we're talking about boot and install in the VM environment which has no care for size?
I think that should be implicitly covered by "All release-blocking images must boot in their supported configurations. ". But it's true we could explicitly mention VMs as a supported "architecture" (or something).