As noted elsewhere, I'm no longer at PhatNoise, so this is all purely speculation on my part.
If you approach this from the mindset of PhatNoise, with limited resources, and the goal of selling as many boxes as possible, it just doesn't make sense to put the large amount of effort into new features for power users that make the box more complicated to use for average users (like the guys at the car company who decide whether or not to partner with PhatNoise!). There's a long list of things that should be done first, like adding support for protected WMA files, and video/game playback.