This article reeks of "my [privileged] experience is everyone's experience".
As we head into decades where water scarcity, driven by global climate change, drives not just regional conflict but actual wars, maybe skipping a shower day or two or not using 1.5 gallons of water to flush two cups of urine several times a day won't seem such a "crazy" idea.
Not everyone has awful B.O. Not everyone is physically active enough to need to shower every day.
And on the other side of this argument, I'd much rather catch an occasional whiff than to be trapped in a room, ride share, or airplane with someone wearing enough Paco Rabbane to drown a rugby team.