Collateral Beauty : Looks like a Children's Movie

With Oscar actors in it

it doesnt

Yes it does. Writing letters to emotions and the emotions become human beings.
That's Kids Movie 101.

That's not something you see in Movies for Adults

I have read the script, and believe me, emotions "don't become human beings". Smiths' colleagues hire actors to play the emotions. It's part of a plan I won't reveal.