Whizbang Dustyboots said:
Isn't D&D, as a game, totally neutral to story arcs?
If you're only referring to the three core rule books, yes -- as a comprehensive system that is the sum of its parts, no.
Even most dungeon crawls still have a defined beginning, middle, and end -- in this, they qualify as a story arc (a very basic one). You might be more comfortable referring to story arcs as "adventures" -- in the context of D&D modules, they're largely the same thing.
Where the default D&D adventure model supports story structure of a very basic sort, the APs are all about plot, specifically plot of a very protracted nature which exists primarily to provide an impetus for character action.
So, no 'D&D' isn't neutral to story arcs. Most of the adventure modules
are story arcs, with the PCs assumign the roles of protagonists. There are exceptions, of course, but even
The Tomb of Horrors has a defined backstory, introduction, basic plot (find the sparkly whatzit), and climactic finale.
I think that these short, terse, story arcs are better suited to most D&D players -- they get right to what they're about and tend to resolve quickly enough that player interest doesn't have a chance to wane. I think that this is a problem with the 1-20 APs, if all of the posts about AP campaigns that get started but never finish are any indicator. I mean, heck, look at my WLD poll a month or so back!*
As to BW, I meant that its default style of play tends to emphasize scenarios of a much smaller scope than the typical D&D AP or even the typical D&D adventure module. The introductory BW scenario "The Sword" picks up where most D&D adventures leave off -- PCs are dividing up the loot from a quest and there is only one magical sword. . . who gets it?
The meat of the scenario is deciding (in-character, via actual game mechanics) who gets what, and who gets a big, fat, goose egg. You know, the stuff we usually decide out-of-character in D&D

**
[*Some forty or so people voted, IIRC. Out of those, only three or four had managed to stretch a WLD campaign past the first few sessions.]
[**The Sword, while it looks like great fun, isn't my idea of a full-blown adventure -- most of the other Burning Wheel stuff tends to fall into the "Expedition" range in terms of scope, and that's more of what I have an interest in. That new Ravenloft looks very, very, sexy.]