I stongly believe that one of the things that most audiophiles don't consider here is the cost of manufacture of DD turntables. A DD motor assembly, and the electronics it employs is neither inexpensive to design nor manufacture. Basically, unless a manufacturer can mass produce it, it is not cost effective. This for the most part rules out high end small company makers. They have neither the capital nor expertise to design a DD that would sound as good as they can make a belt sound, so they don't bother, and rather, choose to focus their efforts in other areas, such as tomearm, plinth isolation, etc.
Companies like Technics, (Panasonic), on the other hand have invested $$$ in designing their DD systems, and they did that a long time ago. They can still do it cost effectively today, due to the thousands of TTs they sell to the DJ market. VPI, Oracle, Linn, even Rega or Thorens, can't do that, so again it just makes more sense for them to go with the "simpler is better approach".
Again, I stress I own both a Rega 2, and a Technics 1600. I always liked the Rega, with exception of its speed variations, (which were VERY noticeable at times). I don't find ANY such "noticeable", (as proponents of belt claim), speed hunting variations in the presentation of the Technics. When I gave the Technics a try, it not only didn't have such speed issues, (and yes, I have a fairly revealing system to hear the difference), the detail, soundstage, (yes 3-D folks...), and dynamics, basically blew the Rega out of the water. Even the things that the Rega is supposedly good at, (the whole pace and rythym thing), the Technics is just simply better at.
Most people don't remember, that just before "perfect sound forever" came out, many Japanese companies, such as Denon, Kenwood, and Nakaminchi, put out some overkill DD rigs. These are VERY sought after by those in the know about them today. Truth be known, most of the technology that those tables used did make it to the better mass produced units...Unfortunately, about the same time these same companies were beginning to put out a lot of plastic junk, that yes, made CDs sound much better.
Some of the larger companies, such as Denon recently are discovering that there is a market once again for audiophile DD units. And they are capable of producing them cost effectively, (most price for about the same as a Rega 3 or less). There just may be a paradigm change yet folks...
My system:
Mac MA6100 integrated
The Hornshoppe Horn loudspeakers
Technics 1600 w/Shure V-15vxmr