Then why enforce the same limit for the iPhone 6s and a top of the line (i)Mac Pro? The elegant solution would be to start with a sensible preset for your devi

Then why enforce the same limit for the iPhone 6s and a top of the line (i)Mac Pro? The elegant solution would be to start with a sensible preset for your device, allow you to change it if you want, and then warn you if some noticeable delays are detected. IE used to do this with addon loading.