Just because you don't say awful things to each other doesn't necessarily mean you don't feel awful things about each other.
Avoiding issues and having bad communications in a M is obviously damaging. Retro can give you some tools to help address that.
That's part of what it did for me. It helped us talk more openly and with less fear, even if it might have felt easier not saying some of the things said. And yups, your post did bring back memories of "fighting fair". I said some things in a way that conveyed what I had to get out, but hurting my W less than it might have had I guess.
Retro is not a magic bullet and rather than saying whether it addresses the right issues or not, I'll venture to say it helps you address issues.
Our CORE sessions are important to us in our continuing journey of healing now. My M did not begin healing just because I attended retro, but I'm not at all sure we'll be where we are now if we did not attend.
Me 42 W 39 Married: 11 Jan 1998, T: Since 1992 First Bomb: Sep 2007 Confirmed A/OM: 4 Nov 2007 Kids: D10, S5 Reconciled and together again after (alot of) time and heartbreak. 3rd kid, S, born 2 Jan 2010.