Added circuitry is not free. Every gram or redundancy is one less gram of mission payload. Added circuitry is also increasing the number of failure modes. That

Added circuitry is not free. Every gram or redundancy is one less gram of mission payload. Added circuitry is also increasing the number of failure modes. That's not to say redundancy is bad or should never be considered but it needs to be weighed (literally and figuratively) against every other part of the mission. Optimizing for mass and mission capability means manufacturing will get more expensive.