Yeah, I love this from a geek appeal and I have a beefy home lab (Dual Xeon Silver 4116 with 384GB, and 12TB of RAID10 SSD connected via 10gig), but being a homelab I want to eke out all my performance so I keep looking at LXC on my Proxmox box versus the optimization of VMs (does this machine really need 8GB or 6? Or 5?).
But when there's the discussion of the amount of time Qemu spends "in grub" and "probing legacy devices", maybe my use case is different, but my VMs aren't constantly being rebooted and when the VM is up it is near native speed so...
I think in most scenarios you don't need to worry so much about kvm ram use, since it looks static but actually it's not and you can over-commit [1]. And of course disk allocation can be dynamic as well. I prefer a lot more security for a bit less flexibility. I am not as ram rich as you are, and still every time I think of my few LXCs, my main thought is 'why did I do that?'.
[1] https://docs.redhat.com/en/documentation/red_hat_enterprise_...