I cant say one way or the other about ramifications of using good or bad power on longevity of devices. Ive done some research on power quality in the past and found that bad quality power will cause issues with "sensetive electronics" in the short term. That was primarily refering to audio equipment, computers, etc where the power supply could cause issues with either specific hardware (spinning hard drives, lasers on disc readers, logic operations due to inconsistent PSU voltages, etc). If spinning drives and lasers were treated badly im sure over time that would be bad. Im surprised that poor quality power would damage a controller on an appliance. Ive replaced control boards on my microwave and refrigerator (both considered quality brands) but just assumed it was based on the throw away design of things today. I refuse to trash it if it can be fixed so i found a way. In those cases, the boards showed no notable damage so i have no clue of ghe real fault.