Because a commonly accepted definition of responsibility is to complete one commitment before taking on another? Because the people that have ordered, and have ALREADY PAID have fair expectation of having a product in hand before someone who hasn't?
Is that enough or do you need more?
You may not be familiar with roll outs for corporations that have an international market, but planning for manufacturing output, boxing/packaging from the manufacturer, shipping slot purchases, documents of declaration for export/import, local distribution, pos planning and management all take place according to a plan set in place long before you paid for your iPhone. When sales/orders exceed quotas set, then delivery times are bumped in markets. Maybe you want to complain that they didn't plan properly, as some people are finding anything and everything to complain about Apple these days. if that's your thing, then rant on.
And the line "...Is that enough or do you want more?" reeks of the arrogance that some of our populace seem to pride themselves on, over and over again, especially when addressing other cultures.