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Or they could do, you know, a simple $0.10 on-off slide switch.

And then they would have to endure 10 million support calls from users who didnt know they disabled the switch and cant make skype/facetime calls.

The presumption that nothing can ever be done, whether right or wrong, is at the very least, discouraging.

The number of people want this is ridiculously small, plus quite ugly.

Ugliness is subjective. Where do you get the data to back up the claim that "the number of people [who] want this is ridiculously small"?