Not all guitars have a truss rod, so wood quality does make a difference there. Though it is needed when you use a soft wood like pine or something. Even when I go to a guitar store and try out different ones with a similar build quality but different wood there is a bit of difference. I'm only gauging on personal experience, it is like mcgyver saying he can't hear a difference between his akgs and his earbuds. I hear a difference between the guitars. I do suppose it also has to do with I don't crank up the volume of the amp, so I can still hear the sound the guitar itself makes which is probably influencing me. Excuse the ignorance, but what is a lack? Never heard of it and google gives me nothing.