The most significant quote of the article: "we expect overseas cash balances will continue to grow unless tax laws encourage U.S. companies to repatriate money".
The corporate tax rate for what Apple is doing is around 35%; that is, Apple would have to pay 35% of their cash pile in taxes if they repatriated it. Which would be generally reasonable if not for the fact that it was already taxed once in the originating country on the original sale. As a result the 35% tax rate is essentially a kind of 35% tariff on exports and foreign sales. You only need to pay it once if you sell within the US, but you pay it along with a second set of local taxes on anything you sell outside of the US, regardless of whether it was even made here. The ultimate effect is that if every dollar were immediately repatriated, foreign sales would either be immensely less profitable than domestic sales, or American companies would be at a significant competitive disadvantage against foreign companies that aren't getting taxed twice (e.g. Samsung).
Congress needs to give up on this pipe dream that they can have 35% of the profits made off of all foreign sales. When no one else is double-taxing like this, it makes the American tax system look foolish and antiquated.