I missed seeing your post earlier, ron1972.
Thank you for the very succinct and to the point information.
The takeaway is that Apple does "magic" in various places to compensate for the high pixel density of the Retina display, but the plain and simple fact is that Photoshop is an image editor, and defines 100% to mean "one pixel of the image maps to one pixel on the screen".
While I agree it would be convenient for Mac users if they could match the "magic" in OSX, it's not reasonable to expect Photoshop to corrupt its rigorous definition of what "100%" means.
The important point to focus on is this: Adobe is not responsible for integrating your user experience across the various applications you use on your Mac. They ARE responsible for delivering an image editor that can be used to create imagery with well-defined characteristics. It's really up to you to understand what's happening and deal with it. I'm sorry that the OS makes this a little less convenient than what it used to be when the display was low resolution, but you DID pay extra SPECIFICALLY for the higher resolution.
I'm very happy to see folks like ron1972 doing their own tests, wrapping their minds around what's happening, and putting up their results here to help others.
-Noel
