Ask HN: Should you discuss issues with manager if you aren't going to stay?

Noob engineer, been a part of the workforce recently. I've decided that my issues are too large for me to stay here anymore. I will move out of this job in a couple of months. While my manager is a nice person, he is not good at management. For a future cordial relationship, should I bother being honest and discuss my issues, what I think are a lack of skills or interest as manager?.