I understand your concerns. Over the past few weeks, I've migrated all three of my systems from Proxmox back to UnRAID. Although I already had licenses, I had to replace the sticks. Then the relevant information came out.
From my experience, Proxmox offers many possibilities, including backup. However, it requires a considerable amount of time. Therefore, I ultimately opted for the convenience of switching back to UnRAID.
None of the systems are as straightforward to manage as UnRAID. While you could run MergeFS and Snapraid on OMV, which I've done and works well, you'd have another system to manage aside from Proxmox, and updating the LXCs and their respective containers takes a lot of time. Not to mention if the SMB connections don't work correctly or if errors occur over time.
Additionally, not all systems have as clear a GUI as UnRAID.
But for now, we're just speculating. We'll have to wait and see. Even for me, it's not easy to consider another change after a weekend of migrating from Proxmox to UnRAID. However, even if the price for a lifetime license is overly high, I'll still consider purchasing it.
It shouldn't be too long now; I'm also eagerly awaiting the relevant information.