i recently discovered that if i heat up milk in a waterbath (a pot of milk inside a pot of water) it also prevents boiling over. most likely because it doesn't

i recently discovered that if i heat up milk in a waterbath (a pot of milk inside a pot of water) it also prevents boiling over. most likely because it doesn't actually bring the milk to a boil, but keeps it a few degrees below the boiling point. in most cases i just want to have hot milk, and i don't need the milk to have actually reached the boiling point. are there any cases where that is not enough? (assuming already pasteurized store bought milk)