[GuB-42]

From my experience, rinsing doesn't seem to have much of an effect, no matter how long the food stays in the dishwasher. I use long cycles though, maybe short cycles benefit from it. Scraping other the trashcan is useful to avoid clogging the filters if your dishwasher doesn't have a shredder.

Sometimes, dishes don't clean properly, usually, it is because the dishwasher is not loaded properly, or overloaded, but when it isn't, simple rinsing typically wouldn't have helped, and washing the dishes before putting them in the dishwasher makes you wonder why use a dishwasher in the first place.

I am aware that commercial dishwashers are a completely different things. These things usually run much more aggressive, faster cycles and they are more about sanitizing than washing, so vigorous rinsing may be necessary.