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Rinsing the dishes before putting them in the dishwasher makes sense to me, too.

The dishwasher takes a small amount of (very hot) water and cycles that same water over everything many times. I don't really want a lot of sanitized (or not) food bits going over everything, or clogging the debris filter, thanks.

Fun fact, some 'dirt sensing' dishwashers sense dirt by using a resetable undersized fuse on the circulation pump. The more gunk in the water, the harder the pump works and the more it triggers the fuse. Count the number of activations to see how dirty the dishes are.