As I reflect on this thread and all the many words and ideas in it, it occurs to me that the M10-D is a bit different in concept and notion from the M Edition 60 and M-D typ 262.
The M Edition 60 was a commemorative special, to honor 60 years of the Leica M, and the attempt was to build a special that was as close to an M3 was in its minimalistic essence as possible. As a very limited run, special edition, it was never expected to sell many units at the very elevated price for a complete package, and of course it was likely considered to be purchased mainly as a collectible and used rarely.
But the minimalistic camera concept was so appealing to many who might have bought such a body at a lower price that it inspired Leica to make the M-D typ 262. Now that camera was a much easier to develop "take a 262 standard production body, remove all but the minimums in configuration, remove the LCD and all the now unnecessary buttons and controls—much like the ME60—for those that wanted such a camera and who meant to use it like they would any standard production camera. The M-D sold well for a special, and a limited feature model, but the draw in this day and age is features and the M-D lacks many features that the market seems to not want to let go of.
The M10-D at its essence is much more a standard M10-P model, with most of the M10-P feature set, lacking only the LCD and associated button controls necessary to configure all the inner workings of the M10-P. The crux of the user experience gained by a camera without LCD, buttons, and setting distractions is thus achieved, and all the settings functions of the M10 are deferred to an app that communicates with the body when reconfiguration is desired, or review of images in storage is required. But the notion isn't the minimalism posed by the ME60 or M-D262, the notion is a full featured camera that doesn't have the issues that LCD and button controls crowding the surfaces of the body pose, and the distractions thereof.
As I've said before, I am very glad I have the M-D262. If I buy another M as companion to it, I can accept the M10-D, or M10-P, or M10 all of them from this perspective, and probably prefer the M10-D because I'll find its less cluttered body easier to hold and more familiar to me. It's closer to the M camera paradigm that I've lived with for most of my life.
However, the "thumb rest" will still have to go. Ten minutes with a Dremel Moto Tool and it's history.