True, but you can enable/disable the multi-device feature at any time. So you can theoretically just turn it long enough to port your codes over to the new devi

True, but you can enable/disable the multi-device feature at any time. So you can theoretically just turn it long enough to port your codes over to the new device, confirm that they work, and then de-authorize the old advice from the account and turn the feature off. I ended up doing as much when I lost my Android tablet at a bookstore on which I had Authy installed. It gave me a mild panic attack at the time, but, a year later and none of my accounts have been hacked yet, so, I have to hope that the other security measures on the device were enough to thwart the potential thief/adversary.