Focus stacking works very well indeed, though of course it is time consuming, makes a lot of files (20/40/80 x 100gb files per image) and can only be used for static subjects. You can of course do it with any camera. this just automates it nicely. I suspect other manufacturers will add it in a firmware update in time.
Disagree about the XF being a 2015 'modern' camera. It's a very old fashioned design, with heavy pentaprism, single point AF, giant clunky mirror, and very heavy weight. Anyone who used an MF camera in the 80s (Hassy, Mamiya, Bronica, etc) would be quickly familiar with it. The new bit is the digital icing added on top, but that makes it more like an old style pickup with some fancy microprocessor trick gizmos, than an amazing new era camera. That would require mirrorless MK with EVF and on chip AF. it's coming, but not maybe not from Phase...