When they introduce their first foldable device this year, keep in mind that Apple has been ideating on and prototyping concept devices with foldable displays long before working prototypes of foldable screens existed. The first Apple patent related to devices with flexible displays was filed in 2011. The first Apple patent related to hinges for foldable devices was filed in 2015.

Foldable device prototypes were publicly demonstrated in 2013. It took five years for the technologies required to enable foldable devices to become mature enough to ship bad products. It took another five years for them to mature enough to meet Apple's scale and quality requirements.

This isn't a "moonshot" (which take decades to build), but hardware innovations like this regularly take a decade to properly productize.