I'd come to the conclusion (standing on the shoulders of giants) that carbon is a poor choice of material for a stem: in order to be adequately stiff, it has to be so massive as to weigh more than aluminium.
No, I think you're right. The benefits of carbon in that application are decidedly marginal at best. I should probably just get a decent 130mm 10 degree stem and forget about the carbon bit.
I'd come to the conclusion (standing on the shoulders of giants) that carbon is a poor choice of material for a stem: in order to be adequately stiff, it has to be so massive as to weigh more than aluminium.
Have things have moved on?