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Yes, actually off-road is another point.
I generally don't leave my good phone mounted on my bars when I go off road. I've never had any issues but I do worry about the vibration trashing either the phone or the mount.
The ruggedised phone that I used for navigation only, (Cubot Kingkong Mini) is pretty small and light, and cheap, so I was happy to leave that on the bars all the time.
PS Quadlocks aren't worth it!
Just get a phone case and a stick on Garmin mount, then you can use phone interchangeably with other devices.