It's because everything in an airliner is heavily regulated by the FAA. Everything has to be rigorously tested and certified. This just increases the developme

It's because everything in an airliner is heavily regulated by the FAA. Everything has to be rigorously tested and certified. This just increases the development cycle length. Compare to car nav systems, which also lag behind. Then add the length of the certification process, (even more extreme) conservatism in the industry, installation time (airliner must be taken out of service for a week or two, which is a lot of forgone revenue), etc. Also, there are power consumption and weight considerations. It may not seem like much for one seat, but multiply by 300 seats in an airliner and it starts be significant. Add that all up, and it's no longer surprising that the systems are outdated.