@HaruEb i think some number of people are also generally worried about wearing batteries on their ears as that's a fire risk. there's also known and suspected risks and sensitivities to radio signals. (ex. the EM from putting your phone on your brain is known to raise the brain's temperature by up to a degree.)

big can foons have a little latitude where to put the radio equipment but ultimately its right up on your head. TWS earbuds have radios on BOTH sides of your head, as they have to communicate to one another and to the computer.

wired cans the EM remains with the device which can be placed away from the brain. (very very sensitivep eople can get air tubes where even the drivers are moved to chest level, although i only have these out of curiosity about air tubes.)