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?
I have several JBL speakers that are awesome. I listen to music and podcasts in the morning while I get ready. Bring it into the shower, carry it around the house, take it hiking. Can’t go wrong with a decent Bluetooth speaker.