For snapshots, you can use filesystem features, like BTRFS or ZFS snapshots. If you make sure to encapsulate everything in the container, disaster recovery is as simple as putting configs onto the new system and starting services (use specific versions to keep things reasonable.

I think that’s also really lazy, it’s just a different type of lazy from virtualization.

My main issue with virtualization is maintenance. Most likely, you’re using system dependencies, and if you upgrade the system, there’s a very real chance of breakage. If you use containers, you can typically upgrade the host without breaking the containers, and you can upgrade containers without touching the host. So upgrades become a lot less scary since I have pretty fine-grained control and can limit breakage to only the part I’m touching, and I get all of that with minimal resource overhead (with VMs, each VM needs the whole host base system, containers don’t).

Obviously use what works for you, I just think it’s a bit overwhelming for a new user to jump to Proxmox vs a general purpose Linux distro.