Good job... or not?

"Always tell people what they wanna hear." - Thoughts kept

But... 

"There aren't any more harmful words than 'good job'." - Whiplash (2014)

First one is my own thought about keeping people happy, because... why wouldn't you want that? Good for relationships, and also avoids unnecessary discussions.

Second one is common leadership advice. I suppose 'good job' just boosts self-esteem but doesn't provide clear feedback on how to improve as a person. Good for growth and leadership.