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.

It also depends what else you are trying to do, but I love PiHole’s ability to act as a proper DNS server for my LAN with support for A and CNAME records