My dishwasher was broken. A repairperson came in and put a new food chopper in. My original food chopper is 4 blade while he replaced a 2 blade one. Will it affect the functionality of the dishwasher? Any concern to have a 2 blade one instead 4 blade?
I don't know about dishwashers... But with chainsaws, they intentionally leave off cutting heads every other cutter (called a "skip" chain). And that allows the chain to move faster - at full speed [with long bars for big trees].
And it is the speed which makes it cut fast. Having more cutters and a slower speed would make it cut slower.
So this may apply to your dishwasher as well? Two blades may be a better design in that the speed of rotation is maintained and it may do a better job because of that?