I well remember the row of non-cubicle toilets in the old brick barracks at the Presidio of San Francisco, 6th Army HQ.
I've been in the Navy since 2003 and I've never seen a non-partitioned commode. The last gang shower I saw was my barracks in boot camp and we were in an old barracks unit, slated for destruction. I suspect the new ones have stalls.
The article is right. Millennials aren't comfortable being naked in front of each other. Several articles lately about the transgender changing room issue go on to say that few high schoolers use the showers after gym class these days. Far different than when I was growing up and everyone showered after practice.