[jasonlotito]

> I must admit, losing a device is trickier because you wouldnt which id to use to restore on a new device.

This will happen. It will happen all the time. And when it does, people will be disappointed. People will stop using your app because they lost everything. I've seen this happen.

This system can work if the data is not important. But the nature of apps that store data or have a concept of "your data is stored" needs to account for cases where the original device is no longer accessible/usable.

> So a device migration can be done.

Relying on device migration is foolish. It will fail. And I will blame your app for losing my data.