considering you would still need to boot the VMs then, once the Oxide system is up, I’m not sure if this is such a big win.
And at a certain scale you’d probably have something like multiple systems and VMware vMotion or alternatives anyway. So if the ESXi host (for example) takes a while to boot, I wouldn’t care too much.
And, economics of elasticity - you’d still have to buy the Oxide server, even if it’s idle.