It is too bad that you can't rerate even after many years.
I played 6.0 mixed doubles with my wife 3 years ago with her self rating of 2.5 (she had never competed in any sporting event, ever). We were able to win most of our matches due to me covering 80% of the court and my heavy ground strokes which most 3.0 women couldn't even return.
My wife got bumped to 3.5 after that, which basically makes it impossible for her to play, because she would be a middling 3.0 at best. Now, her competitive career is essentially over.