Not true (I work for a global US company in EU):
- You can hedge against currency fluctuations, and
- You can simply suck up the losses due to currency fluctuations (it's called "currency headwinds" during earning calls).
BTW: I'm pretty sure that Apple, like other US multinationals, is keeping a lot of its cash in local currencies OUS anyway in order not to pay the high US corporate tax rates on profits...
I know this is a problem from experience. My company is having extreme difficulties with the high US dollar and international sales. In order to keep parity with domestic prices, we are forced to charge considerably more for our international sales and it's costing us sales. You are correct when you said that a company can increase international sales by selling for less but overall profit is much lower.