> maybe you were more careful with the MacBook Air subconsciously because you knew it couldn't withstand being thrown around
I suspect the opposite, actually. The T42 I paid for myself and cared for like a baby, until I heard from too many people that it was built like a tank, and started treating it as such. The MBA was originally an employer-supplied laptop, and thus was unloved from the start. It fell to the ground many, many times. All the corners are dented in, and I once built a computer ontop of it without realising (which then dented in the lid, and probably resulted in the crack in the screen).
I powered on the T42 recently. Such a beautiful machine. Shame fixing the screen hinges requires so much disassembly. I have very little chance of doing it correctly, and the value of the laptop is so low now it's not worth paying someone to do it for me.
Sadly, I'll probably end up buying a macbook pro when the next refresh comes through. Too much friction changing platforms again.