I am a class teacher, so I am often on my seat when other teachers come to take their classes. Sometimes some teachers will approach me and ask how I feel about their performance. I would tell them what I have observed, if they are just perfect and there is any I will tell them what aspect of their teaching could be better. I ask other teachers for feedback too.
It is essential for growth in our chosen path of life.
At the company I work for, there is a tool to request feedback from colleagues, and people are starting to use it a lot. It is a good reflection mechanism.