Some of the other issues that crop up are:
* Sites "adding" increased security mentions to their customers by profiling their connected bluetooth devices * Is the browser only able to see connected devices and not the master list of devices? * Bluetooth devices come in such a wide array of formats that I wouldn't want to ever offer the browser access to these tech (it's clunky enough through the OS most of the time) Last time I let this site access my devices and now it's watching me * All those other options you listed below in another reply, are all high susceptible to a man in the middle attack, and all the sudden your headphones have been turned into a weapon, all because you clicked a link. * Getting your laptop's battery drained even more because of some nefarious website preventing your devices from sleeping
I feel like we need to build a pretty big moat around USB devices and Bluetooth devices, as they're often the easiest points of entry that can lead to further system compromise.