Absolutely true. Cute little writeups like this one are just the gateway drug. It's like trying to get people to learn to play Go. "I can teach you the rules in ten minutes!" You try not to mention the part where the implications of the rules will take up the rest of your life.

You're even underselling the complexity of sound. If one doesn't understand dispersion and coherence one doesn't even understand sound, let alone things like lasers or the band structure of solids. And I don't think students can absorb all of that in one day. It took me something more on the order of a decade.