Any completely open device is going to be a few generations out of date because hardware isn't released with open drivers. I'm willing to use closed-source drivers on my handheld because it means it can use the most cutting-edge hardware at a reasonable price due to economy of scale. On a desktop, 100% open is a more acceptable goal, but in the frenetically advancing tech of mobile devices, the compromise is just not something that is economically (market) viable.