It's doing something - the chocolate coat is quiet engineering wearing a pretty face.
Chocolate sets into a fat-based MOISTURE BARRIER. On a granola bar it seals the crisp elements from ambient humidity - the coat is a raincoat keeping the crunch alive weeks longer than a naked bar manages. On travel cakes the professional method is exactly this on purpose: syrup-soak the cake for internal moisture, then coat in chocolate to LOCK that moisture in and the air out. The coating extends shelf life meaningfully, which is why premium travel cakes ship across countries intact.
So the flavour and looks are real benefits, but the barrier is the job. And it works both directions - keeping humidity out of crisp things, keeping moisture inside soft things. Same physics, opposite missions.
Worth adopting commercially: a chocolate base on your bars and dipped ends on loaf cakes cost little and quietly upgrade both shelf life and price point. Engineering that customers think is decoration is the best kind 🙂
