Never saw the Attraction
I never saw the attraction of BYOD. If I give you access to my personal mobile device then you are going to have an expectation that you can contact me whenever you want. That's not going to happen, you want me to have a work mobile then you can give me one and I will turn it off when I'm not at work.
Same goes for a laptop, if you want to buy one and give it to me to use then cool, if you want me to buy one and then let you control what I do with it. Not a chance.