I’m not so sure I would be comfortable having an electronic device in the "water" with me that could take over the controls of my power inflator and "float" me (try ROCKET) to the surface. I had this happen to me once by accident thanks to sand in my rental bcd inflator valve, which would have killed me had I been deeper.
Another situation we can debate would be "where" would you prefer to be if you did pass out unconscious and not breathing, underwater in the cold waiting for rescue, or on the surface with the bends and possibly and overexpanded lung from rapid decompression? If I were shallow and near the dive boat and potential rescue it might work out perfect for me. If I were without a buddy or hundreds of yards away from the boat or shore it probably wouldn’t make a difference either way. Maybe someone with more medical knowledge can chime in on this line of thought? I’m no expert by any means.