My views come from being a kid who showered in school up until they stopped it. Most of my peers didn't care. In grade school no big deal. In high school the biggest deal as a male was not having pubic hair as a freshman back then, and I went through that phase too. Then you grow out of it and shower. Big deal.
What were our concerns about being forced to shower? The same as the article; worry about getting a boner for no damn reason except puberty, not enough time to shower and dress to get to class, etc.
IMO we should adopt an ideology common to many foreign cultures, mandatory military service at 18. I can tell you from personal experience it not only develops character, discipline, and fitness; you also get over body shyness most ricky-tic.