This is the exact reason it is challenging. There is a lot of variance in how each manufacturer implements it. You might compare it to the browser wars of old -

This is the exact reason it is challenging. There is a lot of variance in how each manufacturer implements it. You might compare it to the browser wars of old - you've got many different players adding various extensions in different ways etc. The actual radio technology and low power consumption are phenomenal, the problems arise mostly around protocol implementation oddities.