Oh, and ya know. I actually do think my ex is quite content. He plays his Vball a few times a week, has his kid sometimes, a W who puts up with his horridness, and no other real responsibilities aside from work.
But do I think OWW is happy? Nope!
Sometimes everything does happen for a reason ginger.
I think about the posts you wrote about you're daughter and ex's relationship. It's actually good that she has a buffer and is learning and identifying at a really early age what is ok. Imagine how things could have been for her had your ex stayed. She and you might not have recognized dysfunction.
If my ex stayed with me, we would have been constantly fighting over his lack of family involvement. My son would have been exposed to this. I could have been responsible for his financial issues. My health could have been at risk if he took up IV drug use, or if he was cheating.
Like you said it's better not to try and fit a square peg into a round hole, or you get stuck with someone uncomfortable that will do anything to get out!
Being comfortable with loss and letting sone one go is crucial yet for some reason we fight it.