well, it actually has a UI for managing ZFS volumes in proxmox lol. proxmox is very versatile I'll admit. I use it also, but because I absolutely need the vm capability to run opnsense and debian on the same machine. If OP only needs a NAS with docker, he may not need that power. well who am I to decide. this is selfhosted so people can just try anything.
been selfhosting the smtp relay and using the app for quite a while. If you use it as a private chat for sensitive content, it is PERFECT. Really looking forward to its future development in group chats.