Because you use Bluetooth passively to be connected to the always-increasing, always more ubiquitous Apple ecosystem. Have you been prompted to input text from your phone while using Apple TV? Bluetooth. Have you used Continuity and Handoff and continued reading a webpage you started on your phone on the iPad or Mac? Bluetooth. Have you received and answered a call from your iPhone on the iPad or Mac or Apple Watch? Bluetooth (and WiFi at the same protocol). Have you used the Apple Pencil? Bluetooth. Have you used the Apple Watch? Bluetooth. When the HomePod is released guess how will you send music to it? Bluetooth (and WiFi, a combination of both). Have you had any friend sending you a bunch of photos saving your cellular data by using AirDrop only to be informed that “you don’t appear” when they try to AirDrop pictures to you? That’s an inconvenience of not having Bluetooth on. You lose a LOT by disconnecting Bluetooth. Now explain to me why, why anyone would want to give up on all that if all they wanted to do by clicking on the Bluetooth connector was just to disconnect a single specific device (like a headphone)? Why the frustrating experience of receiving a call on the phone and then complaining that you didn’t hear the call while using your Mac (and it was supposed to be interconnected)? People are just stupid and stubbornly clinging to ancient ways by keeping their Bluetooth off. Apple should and DOES de-incentivise what is a harmful practice of less-aware customers with the new Control Center toggles. There are many and increasingly uses of passive Bluetooth and that’s why you should never turn it off. Unless you’re a hermit that only uses an iPhone and, apart from that, is completely oblivious to the Apple ecosystem, you should never turn it off. And if you say that you don’t care for any of these things I’ve mentioned, then why are you using Apple products? If anything, the interconnectedness of their products / ecosystem is precisely what they do best. And Apple should NOT accept the lowest common denominator by allowing people to easily turn Bluetooth off. They should help you to use your product correctly. And with the internet of things (want it or not, that’s the future), you should help people to keep their ecosystem working flawlessly. I’m glad changed Bluetooth with iOS 11 so that I don’t lose my Apple Watch all the time I only disconnected a single Bluetooth device. Get along with the times, folks.