There used to be a time, several years ago, when a lot of us would actually turn off Bluetooth if we weren’t using it. Bluetooth wasn’t as essential of a tool as it is today, and some users assumed that it would drain their phone’s battery. Nowadays, though, most people keep Bluetooth on all the time. And as Bluetooth becomes even more essential, Google is making it harder to turn off.
Source : Android 15 Could Make It Harder to Disable Bluetooth