Wrong. The initial CarPlay standard (as it relates to building a car that supports it via the built-in head unit) was only concerned with receiving output for a single screen. To support outputting to the in-dash instrument display, part of the updated iOS 10 CarPlay spec, would require a software update on the head unit as well. I wish Apple had built the standard to think ahead and support the second screen for in-dash, but they didn't, so there you have it.What do you mean? As long as it supports CarPlay, it shouldn't matter, right?
I can confirm that CarPlay doesn't output turn-by-turn to my in-dash screen on iOS 10 GM.