It's been always kinda weird to me that BT spans four layers, from antennas to volume controls. You'd think all the vertical integration should make it reliable and interoperable, yet in practice it's the exact opposite.
BT is one of my least favorite techs that took over. Every damn little thing now has a BT antenna that constantly wants to advertise and connect to something. I'd be willing to use corded headphones again to be rid of it. Might even plug my phone directly into my car... Life would be really hard, but at least we would be free from BT.
