US built dishwashers that underfill
Pretty much all dishwashers had problems with underfilling as they age the valve diaphragm wears out in the valve, all American dishwashers use the same valves so it was no more common on GE than whirlpool and Maytag, etc..
This problem is never caused by mineral buildup, it’s caused by the rubber diaphragm wearing out taking the valve apart and cleaning it will not solve the problem permanently sometimes they’ll work a little better if you take the valve apart and play with it the only real cure to replace it with a new valve or a known good valve.
The good news is this problem has largely been solved, new whirlpool dishwashers now since the water load on the motor and can add more water as needed, so we’re not seeing nearly as much of this problem as we used to, just one more way that modern dishwashers with computers are actually far better than ones with the old mechanical timers.
John L