C) I'm fully willing to admit that I might be alone in this but I dont read reference books cover to cover. Nor do I commit everything that I read to memory. I do remember things that stand out to me when I'm reading. That quote, despite the fact that the DM's Guide is probably my favorite of the 4E books (and remember I dont care for 4E all that much) stood out and annoyed me as I think it was really bad advice.
I'll add to this- I did read the 4e DMG from cover to cover, and 4e is my current primary game. Check the 24 or so threads full of monsters by level that I've converted to 4e if you doubt my genuine love of the system. But that quote stuck out for me, too, as appallingly bad advice
for my group, because we sometimes do like the meaningless, no-action, no-dice, no-real-consequence, pointless except for the joy of roleplaying encounters. My wizard player loves to rp with the local alchemist. The barbarian's player loves roleplaying in depth every chance he gets so that he can Conan out his attitude. The warden's player would be happy roleplaying his interaction with kids playing tag (and even rolling dice for it!). None of those encounters "means" a thing, or has any action, but they are all tons of fun for my group.
I'm not h4ting. I'm not saying that there is anything wrong with a group that prefers to skip all that. I'm just saying it is terrible advice for some groups, terrible advice that stuck out as a blemish in the 4e DMG, which I found to otherwise be a pretty good read (thought the DMG2 is far better!

).
Consider this, too: one of the big criticisms many people level at 4e is that it encourages a minimal-rp, encounter-focused game. My campaign is pretty darn far from minimal-rp and it runs fine in 4e. But even I, loving 4th Edition as I do, can plainly see that it
does promote a certain playstyle as optimal. Tiles and preprinted battlemaps, measurements in squares, the (awful) Delve format, etc etc etc... there are a lot of ways in which it pushes a very tactical combat game style. But my campaign is evidence that it works fine with other playstyles too.
The conclusion I'm getting at here is that 4e doesn't
have to run as a skirmish-style game, but it actively encourages it. It's just fine as a framework for all that other "guards at the gates and fairy rings" stuff too.