Its not even the motor, it's just being belt driven gives it good smoothness and a good level of dampening, not to mention an increased slew rate making it a bit easier to catch slides/drift (again, nowhere near a DD, but still 6/10 rather than 2/10)
Nobody's saying it's as good as a DD, but it's still far superior to the non-DD Logitech G wheels which are still using gears driving the wheel shaft which just feels notchy.
Back when I sold my Logitech wheel (after using my T300 for a year), I gave it a test drive just to make sure it worked and I couldn't believe I used it at all. It wasn't a great experience.
This year I was gonna make the step to a DD, but based on iR increasing VRAM requirements and impending rain, GPU upgrade seems to be next on the table to keep me running smooth in VR.