@Con-Hennekens said:
But yes, a Zumo can be, under specific conditions, be preferable. It would be very bad if it could not... I did not mean to start a flame war, thanks for your motivation in favor of an XT3.
Con, no flame war. I don't have stock ownership in Garmin, and would stop using Garmin devices in a minute if I felt there is a superior (for me) alternative.
At a practical level, a military grade phone (as you pointed out) would meet durability standards. I'm not sure that I could personally live with that kind of a phone as a primary everyday device, given the added weight/bulk, and a less than highest end camera. At least that what I've read about this class of phones. And of course, it's not Apple.
HW aside, there are the many functional differences between a phone app (MRA or otherwise) and an XT3. I outlined many, and they're features I wouldn't want to live without leaving an XT3.
I respect your loyalty towards the MRA phone app. I have the same allegiance towards MRA Routeplanner. I do hope the MRA app continues to evolve and someday reach a level of stability I could live with.