The point is showing that with fully developed mammory glands(read severe gyno) they still don't lactate.
I think that progestins upregulate estrogen receptors or aromatase somehow. So I would always use an AI if I am running a high amount of an estrogen converting compound. I am actually right now on deca and tren with low amount of hcg 500iu. No AI. I used 2mg letro/day last cycle, feels great needing 0. No caber no AI. I do this because I have faith in my knowledge and the application of it. Doing a cut now gonna get down pretty low and take some pictures then bulk again.