Without going into small details, I think the people critical of Mark's position are pissing into the wind -- just from the responses here, it seems that a fairly large set of people (though perhaps not a majority) feel that cameras are getting too cluttered up with options, buttons, menus, etc. So even if *you* don't think this is a problem, apparently a large number of other people do.
It's Mark that's is positioned facing the wind as others have rightly pointed out. Besides Mark, yourself and others are confusing bad design with too many features. Very, very different things.
And just like with new software, people are selfishly complaining because features they do not need are included. I think you'd be rightly annoyed if your favourite fears were elided just because others found them pointless. So don't complain when it's the other way around as you may not like the result if your views prevailed.
....In other words, one decision, to buy the GX7, meant I had to upgrade my Lightroom program, which meant I had to upgrade the OS......
Seeing that Adobe have made a point of not forcing anyone to have to upgrade if someone buys a new camera, if you are in upgrade hell it is because that is a hole you dug yourself. Which you cannot blame anyone else for.
Besides why blame Adobe anyway? It's the camera manufacturers that keep breaking compatibility by pointlessly changing their raw file if a camera model has a name change.