LOL, I sometimes like toying with folks over that. I once had an instructor that forced me to do everything proper. I resisted initially, but it paid off in the long run. With the exception of hard V neck shapes, there aren't too many guitar or bass necks I can't navigate. I refuse to play basses with neck dive. Regardless, very few modern musicians, especially the self-taught have fairly poor technique as far as "proper" goes. Then again, taking lessons from an instructor who is also self-taught might not help things, either.no, that makes some sense; a lot of guitar players who like big ol' fat necks (like me) tend to wrap the thumb over blues-style, as opposed to proper "thumb on the back" technique.
for bass though, a skinny J neck is really good for that, too.