It does because McDonald's isn't the one that suffers. It's the franchise owners having revenue extracted by them from the ice cream company and McDonald's corporate.
Taylor makes perfectly good machines for other restaurants iirc.
Taylor makes perfectly good machines for other restaurants iirc.
Nominally, this is far more idiot proof than other machines which are dependent upon underpaid fast food staff cleaning the machine correctly every single night.
The problem is that Taylor didn't allocate enough development funding because the sales volumes are low and consequently they produced an unreliable machine. Even worse, Taylor gets to double dip by being the only people allowed to repair the unreliable machine.
McDonald's only cares in that the machine doesn't give customers food poisoning--for them, mission accomplished. Taylor only sees positive cashflow from repair and consequently has zero incentive to improve the machine--mission accomplished.
The fact that the franchisees get shafted isn't on the radar.
The complaint is you can't de-idiot proof it, even if you know what you're doing (and some McDs franchises are owned by people who run other restaurants with the other machines).
It's quite possible that McDs requires these idiot-proof ones because the risk of "someone got sick from the ice cream gonorreah machine" is too high.