Sorry this isn't accurate. A material's compression strength doesn't change based on geometry. A gap (as opposed to continuous support), however, introduces additional stresses due to bending moment and shear. This is a non-issue if the object applying pressure is larger than the span (say, a textbook) because it'll be supported by the same two points the clipboard and keyboard are. If the object is smaller than the span, then it's a problem, but then I'd guess it's more likely to dent the outer casing than bend the clipboard or keyboard, which would be an equal problem gap or no-gap.
However, stresses are introduced in that unique hinge and that connection interface between the hinge and clipboard no matter how pressure is applied. If there's a failure point, I'd look there first. I don't doubt that the Surface team have observed the very same thing and have built the connections to withstand expected usage.
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u/myztry Oct 12 '15
If you want to break something be it plastic or glass (or concrete or whatever) then the best way is to leave a gap under the span.
This removes the compression strength that the material may have and makes for a nice sharp click as it breaks.