If you end up with a second proxmox server with its own storage for redundancy in a cluster then ZFS is great. You can mirror each VM. The only issue is the ZFS storage needs to be named the same. But it can be a different size or media.

Can you afford to upgrade? Then No.

Open shell is a helpful solution that replaces some of the problems in the windows UI at least for the start menu.

OpenShell github

It’s pretty easy to customize most things.

You would think with all the money from data centers their support for enterprise GPU use would be great. But as someone who’s tried to install it, I can confirm it’s really basic and the documentation is sparse.