You DO understand this this is one of the TWO possible failures when a fault occurs affecting engine fuel management, right?
If a fault causes rich running, all you get is a CEL. But if a fault may result in dangerously lean AFRs, the DME automactically protects the motor by running in the 'reduced power mode'.
To YOU, you think "ah ha, its that ONE failure- now happening across all these cars"
It reminds me of how prehistoric tribes would try to attribute cause and effect by what they could see....deamons, spirits, etc.
Keep it as simple as possible...but no simpler.