Is she? When JD proposed to his wife, his wife made it clear that she was opposed to JD's mother's ever having unsupervised time with the children they planned to have. (Source: JD's interview with Rogan right before the election.)
Although she dropped her opposition years later after his mother improved, I still wouldn't hold his mother out as an example of a functional addict.
(Also when he was a child, didn't his mother send him to live with his grandparents because she was too dysfunctional to care for him? Or did I get that wrong?)
I wonder if they would've felt the same if his mother was predisposed to having too many glasses of wine with dinner. It feels like a third of Boomer couples I know are functional alcoholics. Way too much enthusiasm for wine, wineries, wine tasting, etc. for it to be healthy.