Not true. A Nexus Device doesn't mean you automatically can calibrate the colors:
There is no solution for the Nexus 10 presently:
http://forum.xda-developers.com/showthread.php?t=2235304
I don't think there was anything for the Nexus 7 either.
Sure devs found a way in the Nexus 4 and I'm thankful for that ability because I'd NEVER go back to the stock colors. With that said, I don't think the proper solution is to rely on the user performing calibrations. I'd still like to see decent out of the box capabilities I'm glad Google's stepped it up for the new Nexus 7.