When you have something like proxmox on metal instead of Ubuntu (even though it does have kvm ootb), you get to create/destroy purpose built isolated environments (vm or container). So say you fucked up your btcpayserver so bad that it is not functional - just delete the instance & start over, no worries about your bitcoind functionality since it’s separate.

Or, say you’re about to fuck around & find out with some complicated maintenance - you can take snapshots & backups that let you rollback quickly to minimize downtime and allow for recovery.

What if you want to drop the specs of your bitcoind instance after IBD to save on cpu/ram resources? No problem!

The optionality is powerful.