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But in all fairness, aluminium frames are also subject to a lot of twist and flex, especially in the extremes like the seat/chain stays and head tube area, think when riding hard out of the saddle, but I appreciate your point about erring on the side of caution
redeye-
A frame and handlebar are two very different component.
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Relatively speaking... no they are not. Or at least not flexed to near their limit (which is important with aluminium, because that's what makes it harden).
Back to the op... here is that zinn article:
http://velonews.competitor.com/2002/12/bikes-and-tech/technical-faq/technical-qa-with-lennard-zinn-carbon-forks-2_3270
edscoble
miro_o
^^ Have a think.
They're items that are twisted/flexed constantly. They will eventually harden and snap and cause a shitty accident. Seems as they cost £20 and it's easy and practical to change them, why would you run them beyond 'definitely safe'.
lol. The ones that haven't snapped are, yes.