I understand that it's "precision engineering"; and, that the result is a fragile product (they are not mutually exclusive concepts).

https://www.merriam-webster.com/dictionary/fragile

I think you're also describing something that is "easily broken or destroyed".

Maybe Apple's superior precision engineering results in a product that is too fragile for their Dorito-eating users. Maybe they could apply that engineering to make devices with better durability.