The author presents a problem in the lack of device model and battery level information. A website/web application may disable functionality due to browser feat

The author presents a problem in the lack of device model and battery level information. A website/web application may disable functionality due to browser feature availablity, but if you disable functionality based on the device model, you're doing something wrong. If you have a scenario where you can disable some thing to make the experience better while maintaining functionality, then why in the world would you ever enable those things? This is simply beyond me. Any suggestions that improve the situation are simply generic performance optimizations that benefit everyone.