Thanks for the comprehensive writeup - very interesting to read the opinion of someone who actually does photography for a living. As a photography (and tech...) enthusiast, it's sometimes really hard to resist the optimization craze :)

I would agree that most of the camera specs are almost irrelevant, I stopped caring about 20, 30 or 40 Megapixels long ago (For Astrophotography, there's even a case to be made that lower MP can be more beneficial than higher MP, if you were to use one body for everything).
The one thing I do however miss on my Canon 6D is the impressive dynamic range of Nikon's and partially Sonys sensors. Is this something you actually care about, or is this another thing that you dismiss completely?
I find it a lot easier to be able to pull up the shadows from one single Raw than trying to merge from an exposure bracket and dealing with Ghosting and the like...