You don't see to many of them out there with adjustable truss rods. I don't build them with adjustable rods though I do use carbon fiber. But on occasion I could see them being use full.
And as mentioned, people always say that the truss rod is not meant to be used to adjust the action but rather the relief. My counter argument is that adjusting the relief is part of the whole of the system known as 'the action' so it really does adjust the action as a sort of by product of getting the relief right.
Where people get it wrong is when they want to lower their action by cranking the rod to a back bow in the neck to lower the action. But if you have too much relief then adjusting the truss rod will indeed lower the action.
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