You know that (true but misleading) statistic that says shoe size is related to IQ? It holds true only up to a point.
The brightness of a bolt-on neck joint (if it has any effect) might be like that.
It's possible that those who build with a dovetail happen to favor a different bracing style, deeper scalloping, thicker tops, two finger braces instead of one, not tucking the tone bars into the lining, etc., etc. -- all things that can have an effect on tone (in my opinion a much greater efect than the type of neck joint).
So, if there is more brightness in guitars with bolt-on necks, it could be related to something not at all connected (no pun intended) to the neck joint.
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Bill
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