I'm surprised that nobody pointed out yet, that harmonic oscillators have discrete energy states as well. I think that's why the explanation is somewhat makes

I'm surprised that nobody pointed out yet, that harmonic oscillators have discrete energy states as well. I think that's why the explanation is somewhat makes things more confusing. The fundamentally different thing about quantum mechanics is that even waves in free-space have discrete energy states. I think the video by 3blue1brown posted by someone else is a much better explanation.