Not worth it on a stem.
As far as handlebars though, just like all carbon is not created equal, nor is all aluminium created equal.
Giant D-Fuse aluminium handlebars are pretty damn good. They genuinely flex where you want them to while not being susceptible to damage in the same way as carbon.
I was shocked that the d-fuse bars on a bike I tested were aluminium, I said to the store owner you could really feel the compliance in the carbon bars and he was like: "especially since they're aluminium".
Since, I went and got a pair for my drop bar bike.
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