But...VirtualBox is a hypervisor, too. It says so in their documentation. I'm sure using the built-in hypervisor framework in MacOS bring performance improvements, but they're changing one hypervisor for the other.
Anyway, taking a guess at what you're saying: do you mean full software virtualization vs. hardware-assisted virtualization? If so, I would agree with you that even best-case performance of HA VMs is not quite bare-metal; sometimes it's close enough to not matter much.
Anyway, taking a guess at what you're saying: do you mean full software virtualization vs. hardware-assisted virtualization? If so, I would agree with you that even best-case performance of HA VMs is not quite bare-metal; sometimes it's close enough to not matter much.