Proxmox kernel vs Debian 12 Stock - ramifications of staying with Stock

I'm looking at the instructions for installing Proxmox on top of an existing Debian 12 system. In section 3.2 it mentions installing a custom Proxmox kernel, with this explanation:

First you need to install and boot the Proxmox VE kernel, as some packages depend on specific kernel compile flags to be set or feature extensions (e.g., for apparmor) to be available.

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The example given is puzzling in that the stock Debian kernel has had apparmor enabled for eleven years.

What...

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