Maybe they’re using a similar system to O2 sensors in SCUBA rebreathers. 3 identical sensors measure the same thing. When one sensor drifts, the computer uses the value from the 2 concurring sensors, and throws an error to let you know something is wrong.
That system is life-critical, so these beans must be about the same importance.
But remember when we found out CFC’s were damaging the ozone layer? Somehow scientists convinced everybody to switch to more expensive, less effective refrigerants, and then it all got better. Gosh, we didn’t know how good we had it back then.