You touched a nerve for me — folks hiking with Bluetooth speakers. My god that grinds my gears. I can see an argument for playing music (at reasonable volume) while relaxing at a camp site, but on the trail it’s as aggravating as a dirt bike or snowmobile ripping along near by.
I've heard many people say the cannot stand they way earbuds feel. Just like many people said they could not breath wearing a mask.
In potentially-dangerous-animal country (e.g. grizzly bears, mountain lions, etc), it could be a safety mechanism...I was told repeatedly you need to make some kind of distinctive noise regularly so they won't get startled by you rounding a bend.