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?
Not completely safe being out hiking and blocking off your ability to hear your surroundings. I think it’s completely acceptable to be considerate while out with a Bluetooth speaker.
You’re wrong. Get some open ear headphones if you’re concerned with hearing what’s going on around you.
Playing music through speakers on the trail is never considerate.