Firstly, I’m not aware of any such vulnerabilities affecting iPhones, because their Bluetooth capabilities are quite sparse (no file transfers etc). Also their power management seems to be smart enough, that the power usage is quite negligible, in my experience.

Well, here's a recent one, for example: https://www.armis.com/blueborne/#/devices

> Not to mention the power-saving advantages of turning off wireless radios.

Rather than turn off each wireless radio individually, there's a faster shortcut which is to activate low power mode. Low power mode will turn off wireless radios not in active use so this means less clicks for the user.