They are not nutritional powerhouses, but sometimes I just enjoy a milk - in a recipe like my smoothies or some baked recipe like a cake of cornbread. HRH likes it in cereals. And the nut milks answer that need for a milk consistency in recipes, with nothing in them that's going to hurt us. I've been using nut milks since the 80s before it was in the stores and we used to make our own, when my older kids were young. We've always liked it. I used the Fit for Life recipe for Almond Milk then, but we drank cow milk, too (I wonder now if some of dd19's "colic" was due to cow milk products). Yogurts were a favorite for me until acid reflux let me know what a bad idea that was for me, lol. Harmony had to listen to me complain about that.
Nowadays I mostly stay away from cow milk. I'm sure we get some in products of already made foods, and that's fine. But I don't want much of it - the hormones are the big negatives, but also the antibiotics, the high load of toxins. There is protein but I get plenty already from foods that have a lot more nutrition to offer. I don't know of any nutrition cow milk products offer me. There was never any protection from it against brittle bones - the more cow milk consumption a country has, the higher the rate of bone fractures. There was never any truth to that business of losing weight with it - the FTC made the Dairy Council stop that ad campaign.
I wonder if some parents have gotten nut milks confused with soy milk. The USDA does count soy milk as a "dairy" serving, which is the circle off to the side of My Plate now. The nut milks on our shelves here say "not for use as an infant formula" on the carton, so I guess if they have to say it, it must have come up as a problem. The connection between soy and breast cancer is not as certain as it used to be - in the countries where women eat so much soy there's very little cancer. My dstepdil's mother avoids it for the same reason, though - she's had a lumpectomy in the past and doesn't want to rock any boats.