The projected low cost of an FF unit forces any thermal recovery system to have a very low price if it’s to make sense at all… and such systems are not known for their low pricing.
As you noted classic recovery systems start out costing as much as 1 or 2 complete FF units and only provide a fraction of the power of those new units… and so far “nano” anything has only been cheaper when placed in the context of the current status quo in power plants.
