well, they're anomalies, so i don't think relying on the stereotype of short asians really explains a handful of oddly-built bikes in the market.
i recall reading something (i have no idea who wrote it) about one successful rider prefering a very steep seat tube, and his style was mimiced.
personally, i need to be further back in order to spin, and too much weight on the front makes me feel unstable.
but hey, they ride six laps.