Definitely true, again adult interactions are transactional - why bother with idioms, better downgrade to simplified version which can be surely understood. As

Definitely true, again adult interactions are transactional - why bother with idioms, better downgrade to simplified version which can be surely understood. As for kids that true on any language, we known and expect that kids language subset more narrow than adult's that's why we repeat the same phrase multiple times with different wording.