Traditionally laptops have had far too many moving parts to be durable:
- 1 or 2 fans
- Keyboard
- display hinge
- Hard disk
- CD Drive
- often various flaps or expansion area
Whilst laptops are improving in this area, iPad have not had any of those from the beginning - it clearly makes for much more durable device. Additonally almost all laptops are high maintenance software wise with the possible exception of chromebooks.