Yeah, but people are continually scammed out of their life savings for snake oil that promises to do the impossible. If your making 100k and spend $30 a month on some bottle of homeopathic nonsense and placebo yourself out of a headache, that's fine I guess.
But the person who sold that to you is also getting hundreds of dollars a month from people making barely more than that by selling tic tacs or whatever at a several thousand percent markup, promising false hope to the vulnerable at the mere cost of everything they own.
Bit of a sore spot for me I guess, just because of who I know. What you say is technically true - a bit of extra placebo might be fine, but so many fall really hard for them, and the "innocent" use helps by middle+ class people who can afford it helps legitimize it, making it easier to prey on those who can't.
Man, I can't even imagine wanting to bring my phone into the shower. "Just standing" there, alone with my thoughts, hot water relaxing muscles... Nothing needs me, I need nothing, the world is on hold until further notice. It's meditative: Everything ceases mattering, ceases even existing - to resume later, of course, but in the meantime, perfect, relaxed, complete solitude. It's perfect as it is. Music or videos or reading would ruin it. That's all outside stuff, the outside should not exist.
It never even occurred to me that people would bring phones into the shower to actually do things. Never even imagined that that was a thing. Learn something new every day.