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@gbj_tester
Because they are wedded to the idea of housing the bearings inside the BB shell. Most internal BBs use 17mm ID (e.g. 6903) bearings, although I'm pretty sure 6804 (20mm ID) would work for a BB, yielding a 66% increase in torsional stiffness for no additional weight.
However, Campagnolo have clearly shown that it's possible to have a low Q even with two rings and clearance for the chain to swing out to the top sprocket on a 130mm wide rear hub, as well as plenty of heel clearance and external bearings of 25mm ID. These USE rings on a 105 HT2 crank will also kick Royce's butt:
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