When provisioning new rancher cluster or new nodes, vm templates are old enough that it takes at least one hour [1] to provision one node.
It's too long.

Updating template should cut down that time by some unknown order of magnitude.

To reproduce, just clone out of the proxmox ui our template 10008 (bullseye-zfs) and start it.
The boot takes forever as cloud-init is upgrading the zfs part (kernel module compilation and whatnot).
That must be the pain point which should disappear altogether if we upgrate that template.

[1] D8155#212105