The main advantage of the modern GUI is when you need to perform wildly different tasks on them. Physical controls may not be appropriate to every task. This wa

The main advantage of the modern GUI is when you need to perform wildly different tasks on them. Physical controls may not be appropriate to every task. This was the pitch when Jobs unveiled the iPhone, and it makes sense. However, if you have a device with a single function, there's no need for that. Your physical controls will always match the device's function. Use those.