I think you got plenty of great answers already. Security is not a real concern for a home user. It’s not even for the enterprises. Container escapes are extremely rare and Kubernetes is used very widely among some of the largest companies in the world running thousands of containers.

I think in general people start out in VMs and advance to containers. If you are already using containers stick with it, otherwise you are taking a step back.

Now for why you might want to run proxmox? I do it because I wanted windows, Linux and Jellyfin with hardware decoding on one server.

I migrated to Z2M about a year ago and I have had nothing but problems. Mostly around stability of Mosquito. I am back on ZHA now and find it infinitely more stable and reliable. If Z2M ever does a direct HA API integration like ZwaveJS does I’ll probably go back.