It is indeed faster and more accurate to use physical keys on a smaller device.
The competition is the exact same thing btw, with less screen and tactile feedback. Both will give you text thumb repetitive stress problems, but doing that on a hard screen will more so. Remember, this isn't theoretical, we used to use these all the time.
The drawbacks of a physical keyboard are in things like flexibility (you can't easily remap or change the size of the keys) and thickness.
The competition is the exact same thing btw, with less screen and tactile feedback. Both will give you text thumb repetitive stress problems, but doing that on a hard screen will more so. Remember, this isn't theoretical, we used to use these all the time.
The drawbacks of a physical keyboard are in things like flexibility (you can't easily remap or change the size of the keys) and thickness.