I would tend to think that they build graphite necks alot less rigid these days so that a truss rod could actually move the neck.
Graphite truss rod.
Both the double expanding truss rods and the graphite rods will affect tone bad or worse is subjective.
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Personally i don t need the weight or the added stability where i live the single rod necks are very stable so i have only one neck with double expanding truss rod.
The truss rod is component of a guitar or other stringed instruments that stabilizes the lengthwise forward curvature also called relief of the neck usually it is a steel bar or rod that runs inside the neck beneath the fingerboard.
If you really like the neck just put a washer in there it s a good solution.
Graphite bars are also available for an additional 60.
Anybody who has an old modulus zon or musicman cutlass without a truss rod please comment on how straight the neck has stayed over the years.
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The stiffening bars installed on either side of the truss rod in super bass necks enhance stability and add mass which helps to eliminate dead spots.