For many devices (e.g. a power tool, or part of a vehicle) making a chip that lasts for many years would be more efficient than replacing it with one that drew

For many devices (e.g. a power tool, or part of a vehicle) making a chip that lasts for many years would be more efficient than replacing it with one that drew less power but required a large batch of power to manufacture, plus the cost to dispose of the old one. Also, there are many hardware components besides CPUs where durability and repurposability would far outweigh operating efficiency.