The iBooks were pretty tough but I remember the poly MacBooks getting pretty brittle with a few years of usage. If they go back to plastic, it better be something strong.imo, the macbook air does not need miniLED nor does it need ProMotion nor to be made out of metal. i'd much rather it be made out of some quality plastic material (aside from some metal on the bottom for heatsink). this way, the laptop would be lighter and better at taking fall damage and maybe even a little cheaper