Well, of the 8 images used to illustrate his point, only one is what I would consider a classic "landscape photograph". (with 3 wildlife & 3 urban & the guy in boat).I have to wonder about the longer focal lengths for landscapes though, since the sheer distances involved usually mean much more air between camera and subject than with bird photography etc., and that air isn't always sparkly clean.
Regardless of that, it's great to have the option of a longer lens - to pick little scenes out of the grand vistas.
I'm often covering the same range (24-600), but with two cameras. (E-M1 and E-M5 with the 12-60 and 75-300).
That's why I'm eyeing the G3X with some interest.
As it is (at this price, especially with the viewfinder), I'm going to wait though... For a pricedrop, or a mkII...