They went over their multi-layer design to give it strength and flexibility, and noted over 100 components in the hinge alone. I'll be looking out for JerryRigEverything on YouTube to see how tough it really is!
While Apple certainly looked at the competitors to see what problems they had, it's far from a given that Apple has managed to actually solve the durability issues, either, much less on their first attempt.
Imagine they have 100 previous versions as it’s been mooted to have been in development for years