Just noting two more pitfalls:

1) When you create a new device, you should overwrite all the content (standard 
mkfs is not enough) before attaching it to a VM. If you don't do so, the VM 
might get some old data leaked from another VM. Maybe thin LVs have a different 
behavior.

2) When booting from Qubes installation image and trying to perform system 
recovery, it seems to scan all LVs, regardless they are dom0 LVs or domU LVs. 
This is potentially dangerous (filesystem parsing bugs). And since the 
installation image is not updated frequently, there is even higher probability 
of a known unpatched vulnerability. Maybe it could be determined by the name if 
it should be scanned.

Since LVM thin volumes are to be used in Qubes 4.0, I'd like to ask you if 
Qubes addresses those two issues there.

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