The node is not nearly as relevant as the design of the SoC to optimize for low power, and the large amount of supporting software work to actually make it real

The node is not nearly as relevant as the design of the SoC to optimize for low power, and the large amount of supporting software work to actually make it real. Phone SoCs are generally optimized for this, but the lifetime of a part in the market is too short for something like the raspberry pi.