Bluetooth implementations are so stupidly quirky I can totally see proprietary dongles as being required to guarantee connectivity.
Fitbit won't pair with my phone, but works OK with my wife's and my tablet. Garmin fitness tracker syncs with all 3 devices, but will stop syncing with my wife's phone within 2-3 days and will need to be paired again..
My bluetooth headphones work with my phone and my wife's phone, but not my tablet. Every 6 months or so I still have to use a paperclip to reset the headphones to be able to re-pair them with my phone after they stop working for no reason.
I've seen similar problems with phones I've owned before.
Fitbit won't pair with my phone, but works OK with my wife's and my tablet. Garmin fitness tracker syncs with all 3 devices, but will stop syncing with my wife's phone within 2-3 days and will need to be paired again.. My bluetooth headphones work with my phone and my wife's phone, but not my tablet. Every 6 months or so I still have to use a paperclip to reset the headphones to be able to re-pair them with my phone after they stop working for no reason.
I've seen similar problems with phones I've owned before.