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My old Dell 1558 used to do this, I had to completely take it apart every few months and hook the dust out of the heatsink and fan assembly.
It was all down to poor design really, the single large fan intake being right on the bottom worked like a hoover to any surface the laptop was placed...
While I can see this being a benefit if temps are an issue, I'd imagine it will increase drag quite a bit won't it? The increase in drag would be greater than small weight saving for sure, so surely the enhanced cooling must be the only reason to do this?