Originally Posted by metron
Genuinely curious - why would one want more vibrations to transfer from the neck to the body? Theoretically that translates to loss at the transducer.
I thinks this depends on how much intrinsic damping we have in the woods. When it is NOT lossy it will redistribute vibrational energy in a good way, giving the instrument a more distinct timbre (think vocal formants). If there is loss at the joint, sustain and brightness/harmonics will suffer a bit, typically, since all energy must travel through the joint, multiple times, back and forth.
Then again I always found that even minor truss rod adjustments can have quite big and unexpected impact on tone (dead spots notably), much more than pocket adjustments, but YMMV.