This is something from Official Qubes documentation-
Some devices do not implement a reset option. In these cases, Qubes by default does not allow attaching the device to any VM. If you decide to override this precaution, beware that the device may only be trusted when attached to the first VM. Afterwards, it should be considered tainted until the whole system is shut down. Even without malicious intent, usage data may be leaked.
In case device reset is disabled for any reason, detaching the device should be considered a risk. Ideally, devices for which the no-strict-reset option is set are attached once to a VM which isn’t shut down until the system is shut down.
So I wanted to ask that if my sys-usb use my pci devices (usb controllers) with no-stict-reset option then Is it mandatory to shut down laptop after using a block device like sda1 to attach to vault and after detach and removal from PC. And if I don’t shut it, I shouldn’t shut down my Vault VM? Or this paragraph is meant only about that we shouldn’t shut down sys-usb VM. (or anything else) (sorry, I was unable to interpret)
And what is the real meaning of usage data may be leaked?