The R4 was essentially 2 S9 boards rearranged for better (vertical) airflow. The scrolling fan its most distinct feature, i think makes a very good silent heat spreader for winter.
Unfortunately nobody else has shown interest in this concept, the living room miner.
Sure, you can always run a regular S9 at low power using Braiins OS (even using a single fan), but i think the wider aperture of the R4 makes for a better spreader. A shame, really.
I totally agree, it would have been nice to see another home miner on the market, instead of the "no brain farm" models that almost exclusivly exist on the market.