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I wasn't saying that I want a 2.5 inch drive, I was merely listing off a number of rather large things that fit just fine within a 20 mm budget.

I'm not sure why you seem to think that making something thicker would reduce the stiffness or strength. It's generally the opposite - see the concept of a torsion box. Anyway that wasn't the point. The point was that regardless of how thin you make the thing it will forever remain a cumbersome and delicate item that you have to treat with care when packing so what meaningful positive impact does shaving off those last few mm have? It's never made any sense to me.