A couple of things:
First, I went to check out AA's alleged 'DD bashing' and couldn't find it -- could someone direct me? It's been years since I perused their offerings, so all I could determine was that they had no DD TT's for sale.
Second, it's axiomatic that in mechanical systems, the fewer moving parts the better (the differences between German and British automobiles are a perfect example ;-) "Better" BTW applies to lo-maintenance as well as hi-performance.
That said, the cost and process of implementation become key factors. When it comes to turntable design (and without going into the "characteristic sonics" BD v. DD v. ID), it turns out that the elegantly simple direct drive design can be more expensive to build compared to a belt drive TT of equal performance -- up to a point! (my personal opinion is that Micro Seiki reached that 'point' with their belt drive TT's some time ago) Beyond that point however, throwing more money at a BD design will not IMO result in any measurable performance increase. Why? Count the parts! (Same goes for ID TT's)
So, for speed accuracy and freedom from mechanical artifacts (rumble, vibration, mechanical resonances) and maintenance bordering on 'zero', the DD TT is the ultimate mechanical solution. But you can't "cheap out"! Well, actually, you CAN, but a cheap DD is worse than a cheap BD, and that's where the bad rap came from. In the beginning ;-) you see, it was so inexpensive to produce a reasonably good performing BD TT (Rek-o-Kut, AR, and beyond) compared to a reasonably performing DD, that nobody bothered with DD's after that, except the utterly shameless Japanese, who turned out some amazing machines! Of course they cost more than Western BD's, so for us Westerners, BD's ruled for years. Even the new $300K Goldmund Ref. II uses a belt!
Sonics are another matter, can vary widely, and depend on many factors in addition to the drive design. Sonic accuracy, neutrality, and control are hallmarks of the best DD turntables, but they can be found (occasionally ;-) in other designs as well.
.