My city is in the middle of the worst drought in recorded history. My showers are typically under 2 minutes and I have to shower with a bucket to catch otherwise wasted water to use to flush the toilet. I also shut the water down when I am wet enough so I can scrub myself without having unneeded water flowing then start it back up to rinse.
Plus, water is damn expensive!
Who here really has the time to stand, think and waste in the shower?
It’s how dishwashers work: more cycles = more rinsing, then later rinse it all off.
You could do a quick pre-wash, then a long cycling of water, and lastly a rinse with clean water.