My opinion is a bit different. I truly believe, that the majority of the sound is coming from the neck in solid body instruments. In other words the neck and the fretboard have a larger effect on your sound than the bodywood. It's not only the quality of the wood used in the neck, but also the shape, the amount of wood (think about Stingray necks or Precision necks), etc.
Normally, necks have a finish which let the wood dry out.
So I believe, that your instrument's sound will change if you play a lot on it, and especially because your neck and fretboard will resonate on a different way. It's not only moisture, but also, the microstructure of the wood will change slightly thanks to the billions of gentle motions the resonancy causes.
This is the same for violins, double basses, hollowbody instruments, but in their case the body has a bigger factor in the overall sound, and time and practise will change their sound on a much more audible way than solid body instruments.