Seeing as the survey links are broken, at least for me (see here), I'm posting on the board instead.

A feature I haven't seen discussed but which would be extremely useful is nested hypervisor support under Hyper-V enabled hosts (i.e. using the Windows Hypervisor Platform). I've posted some thoughts about this before here, but to summarise, if running on a host which is Hyper-V enabled you can't run guests under VMware Workstation which expose Intel VT-x/EPT. I assume the same issue is present if exposing AMD-V/RVI but don't have such a system to test on. Virtualising the IOMMU does work.

The impact is you can't run nested virtualisation scenarios on a system with Hyper-V enabled, be it because you actually use Hyper-V alongside VMware Workstation, or it's a dependency of other features like Device Guard. Where this is particularly frustrating is it blocks running VBS enabled guests as they require VT-x/AMD-V.

This limitation doesn't appear to apply to Hyper-V itself, as such configurations work fine on Hyper-V VMs, which suggests it's technically possible.