That is the beauty of routing and how to rout holes to make for a good walk. I think some architects do this well and others do not even consider it.
With no offense intended, but can you tell me where this (the beauty of a routing is how to route the holes to make for a good walk) is written? And no fair citing the Yank (who is so far out on the Bell Curve to make him statistically insignificant, though there is probably someone in this DG who would argue that the walk actually begins from the parking lot).
I agree in part with the second statement. Some modern day architects manage to provide an interesting course that is walker-friendly. I am unaware of any architects who give no consideration to the proximity of greens to tees. Perhaps some are more concerned with the client's objectives for the course which may include having the best 18 holes on a large site, catering to a membership or customer base which prefers riding in overwhelming numbers, other uses of surrounding real estate, etc.
It would seem to me that with the motorized cart and the very clear preference in many places for playing golf in this manner, routing principles have been liberated in that it is no longer necessary to site a green right next to a tee (or vice versa). Fewer indifferent connector holes, perhaps better flow, making more sites suitable for golf, and enabling the game to be more accessible to players who lack the physical necessities to walk seem to be more than adequate reasons NOT to look down on some "un-wakable" golf courses.
BTW, I am among one of the relative few who will huff it even when I can take a cart for no additional fee. But as David Moriarty notes, there are a variety of factors which make courses "un-walkable". I saw Craig and Evan walk Ballyhack and perhaps they enjoyed the experience. I played with Craig at RNK when, as I recall, he attempted to walk the course with some help from the cart riders. We played the course at 6000 yards and it was a long round.
Stone Eagle is my candidate for this thread. The course was so rugged and hot that a gentleman in my group retired after the fourth hole. And he was riding. Craig or Evan might make it on a cool spring day, but these are admirable if not normal men.