2016 MBPro, 15" retina, Touch Bar, Sierra 10.12.6. Dual GFX, yada yada.
I also observed this intermittent slight, subtle color temp shift early on in ownership of this unit. As a production video engineering tech I am used to quickly seeing the effects of color shifts, due either to the display monitor or to lighting changes on a photographic or video subject, and am familiar with monitor calibration procedures. I had taken the MBPro in to the Apple store for an audio issue, and mentioned to the Genius taking care of me that I was seeing, on unpredictable occasion, the same little color shifts being talked about here. His reply basically, "oh yeah, they all seem to do that" to some extent, and that since the display panels for these models were essentially all identical, a replacement would very probably not be any different. It's a rather minor issue for me, so I did not pursue it. One thing I did do, that's helped a bit, is to go into the monitor Color tab setup in Displays Pref pane, and very, very, slightly tweak up the Blue level. Once satisfied with the look of the screen, I saved this as a separate Display Profile. If I see the screen going a tad warm, I de-select and re-select the new profile, which seems to bring it back to how I like it.
