I often change stuff around, removing zigbee and zwave devices and reinstalling them later. In the mean time I simply disable them in the UI but I don't exclude them because it makes easier when I change my mind and decide to put them back in service.
I have been doing this for months and it doesn't seems to cause any problem. Am I just being lucky and playing with fire?
Disable simply blocks the cascade of an event.
Take a Door/Window sensor as an example... the door or window opens or closes and that device does what it does.. sends a message to the hub. The hub has to dedicate Z-Radio time to receiving the message (and ACK).
None of that is saved, Whatever Event the message would have created is blocked by the disable of a device. The Radios are, in my opinion, (and due to their low speed relative to the 21st century) the resources that need the most 'protection'. Thus disable does nothing towards that goal.
On the other hand, it greatly impacts logs in a positive way 
My development hub uses Disable extensively
If I undestand you correctly, since the device is removed, no event is going to come from it. Therfore, it has no impact on the hub and disabling it or not makes no difference.
Yes, a 'factory reset' or powered down device isn't going to send messages. Therefore disable has no effect in that direction. As to the hub attempting to send to the device, disable would possibly affect that.
Overall, the picture in my mind is that Disable affects Events. Disabling the Event while having no effect on the physical device, obviously.
This is fine with zigbee devices but will generate ghosts with zwave devices.
Currently I do that with non repeating zwave devices and a uzb stick. None of them are used by other devices. Could it create ghost problems? It does not seems to.
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