Since TrueNAS SCALE now supports instances, is there any point to running on top of Proxmox?

Proxmox uses LXC for containers and KVM for virtualization. TrueNAS SCALE (now) uses LXC for containers and KVM for virtualization. Is there any use-case left where it still makes sense to run SCALE inside of Proxmox, or is it just as good/peformant to have SCALE handle both NAS duties as well as the other things I would normally run in containers and VMs?

Could I, for example, set up a container/VM that needs especially quick I/O or a very fast single-thread CPU process in SCALE and expect the results to be about as good as they would have been in Proxmox, or is there more to it?