Single Loop Learning and Management

Single loop and Double loop learning (terms coined by Chris Argyris) are different in the sense that single loop learning is learning about a phenomenon while double loop learning is learning the process (values, reasons, hidden mental models etc) behind the phenomenon.

However, isn't it strange that while managers have the process and double loop knowledge of their functional area, they operate on single loop learning when managing people?

I wish all managers who manage people make an effort to understand people and what makes each one unique, what is every individual's goal, what they value individually and as well as a group.