I think it was Technology Connections that did a video on French door fridges. One major problem with them (among the countless others) is airflow. Refrigerators have one refrigeration unit for both the fridge and freezer. The air is cooled in the freezer and moved to the less cool fridge. Cool air is denser than warmer air so it falls. Conventional fridges (freezer on top) were designed that way on purpose. When the freezer is on bottom you add levels of complexity and work against what has already been proven effective. That’s not a problem, per se, because humans are ingenious. But in order to compete with traditional fridges these companies have to do this at the mercy of the lowest bidder.