Bluetooth is definitely not one of those "uses those standards just fine" cases... if a user has just a dozen peripherals, a even a 99% success rate starts failing on you pretty often
On a more personal note, I have to keep a mental map of which bluetooth devices will work with which bluetooth receivers... the tech is not NEARLY as universal as people like to think it is. Generally speaking, devices of the same vintage (or make) will talk to each other, but it is a crapshoot as to whether my a v2 headset will talk to a v4 USB receiver, or be seen by a new laptop/ipad/whatever.
On a more personal note, I have to keep a mental map of which bluetooth devices will work with which bluetooth receivers... the tech is not NEARLY as universal as people like to think it is. Generally speaking, devices of the same vintage (or make) will talk to each other, but it is a crapshoot as to whether my a v2 headset will talk to a v4 USB receiver, or be seen by a new laptop/ipad/whatever.