What's the real use of a bluetooth API in a browser?
What good things are you going to do in a web app that you can't do in an app, or you can't do an app because Apple wouldn't approve it?
Measure that against the massive privacy violation of being able to be tracked in public places that have bluetooth beacons set up. Not to mention the potential for an evil web site (or one that has been compromised by malware) to attack or bug your bluetooth devices. Just because you can think of a few useful things you could do with it doesn't make the API any less of a security and privacy nightmare. I can think of a few positive outcomes if the FBI had a copy of keys to everyone's phone, but that doesn't mean I support that either.
Google just thinks they can create all sorts of privacy violating APIs and force them on people because they have the dominant PC browser, which will soon also be the dominant mobile browser on the dominant mobile OS. They're pissed that they aren't able to dictate standards like Microsoft used to, and people are seeing through their shenanigans so they're trying to frame the argument in a way that makes Apple look like the bad guy - ignoring that Firefox is also not on board with this stuff.
Whether you attribute this particular stand to Apple being on the side of privacy, or to Apple being on the side of walled gardens, and whether or not you ever use an Apple product at all you should thank them for standing in the way of this crap. You could have made the same argument when Jobs refused to support Flash and said only was only trying to protect their App Store, but in starting the avalanche that took down Flash they ended up rescuing the PC/Android world from that security nightmare.
Had Apple blindly supported Flash on iOS it would still be very much with us today. Probably have had a lot of "helpful" extensions added to it over the years that did stuff like interface with bluetooth and provide a list of wireless networks are near for the Flash app's author to use for tracking, and sale to data brokers. And all with Adobe's famous attention to security!