Seems pointless and inconvenient for me as they usually seem to be poor quality, and can you really listen to music in the shower, and are you showering long enough to benefit from it?
Or do you own one and use for a different purpose, like swimming or Kayaking?
It’s great for podcasts or morning news, I would imagine. Like pop in the shower while you listen to NPR or the local news stuff. I remember as a kid, listening to morning radio with traffic reports, weather, and current news to talk about during your workday.