If you have been through a certain experience, you will undoubtedly have some practical advice to share with someone going through the same situation.
That experience allows you to speak with a voice that resonates greater than someone who lacks this experience.
I work with people all the time that have injuries and associated pain and other symptoms. I have become very skilled at helping these people, even though, I have suffered only minor injuries to this point in my life.
If you truly want to understand someone's situation, walk a mile in their shoes, right?