And that cuts both ways, of course. If you're convinced the nut doesn't make any difference, you'll attribute any perceived difference to something else. I do this for a living and my job is to make people's guitars sound and play better. Just for fun, I've made "nuts" out of cardboard and compared them to bone. It's easy to work a lifter in between the strings and board, remove the nut, replace with another, and listen. You don't even have to loosen the strings, although you will have to re-tune. Use a 2nd guitar as a control, and compare tones. Compare, switch to Nub B, compare, switch back to Nut A, compare, repeat. Suit yourself.