Since our first moments on this planet, we have been using feedback to learn about the world around us. Research backs this up: focusing on feedback results in 3x more learning process than reducing class sizes at 1/4 the cost.
Teachers typically spend 10-15hrs/week reviewing student work after an assignment is handed in, almost always on evenings and weekends. That's not good for teachers or students.
Asking for feedback requires vulnerability; acting on feedback requires humility. We all have a backstory that influences our capacity to ask for and act on feedback.