Apps already work on Apple devices with many different aspect ratios.

This way you don't need to design your app to work with different aspect ratios, because it's always the same.

	▲	ytpete 2 hours ago \| parent \| next [-]
		But you still do need to support different aspect ratios if you want your app to work on any other iPhone models, because many of them differ.
	▲	chrisco255 2 hours ago \| parent \| prev [-]
		Even if it were true you would also have to design the app for when the device is rotated.

Easier to support one more aspect-ratio then two.

Unless these things start selling like hot-cakes (unlikely at the price) a lot of developers just might not bother.