It is just very very hard to do. You have to get all these different device manufactors together to sign up and agree on how you measure a device. If my phone breaks and my phone company gives me a new one of the same model as replacement, does that count? What if it breaks and I buy one myself off amazon and claim it of my phone insurance, does that count? What if my phone is stolen? Does that count? For computers, it's even more complicated. It's a Sisyphean task and someone will get burned.