I think that's an ideal situation, but it is rare based on the experiences here of LBSs who have sought counseling with their MLCer. Most MLCers do not want to be active participants in healing the marriage while they are in replay. Mine sought individual treatment from both a therapist and psychiatrist, but left both when he did not hear what he wanted to hear. The man I knew him to be for over 20 years prior made decisions based on other criteria and was more than happy to work on his issues, but this new guy he has become is satisfied where he is.
The welcome message, I believe, is perfect. When I first posted in 2012, I remember feeling so validated that someone was finally saying this was also about me, not just my spouse. It helped me self-focus, and I believe that's the most crucial part for all of us.