Many on this forum people fail to recognise that the issue with the FP1 being stuck on 4.2 has much bigger implications than ‘having the latest OS or Apps’. The FP1(U) is stuck on Android 4.2 because the drivers are not available. The drivers not being available also means no alternative OS will be available. Read the impressions of the FP1(U) on the xda developer forums, developers are quickly losing interest in the FP1 as a platform.
Having root access without drivers is similar to being given access to a car. But then you find out you’re not allowed to use the steering wheel, or the brakes, or the tires. You still have acess to the car, it’s just that you can’t do anything to change it.