Smelly washers is not just a FL washer problem, the biggest single is washing in cold water, the second biggest problem is too little and or cheap detergent, warm rinsing sometimes makes the problem worse as it leaves the washer at the perfect temperature for mold and bacteria growth.

I have worked on and seen thousands of automatic washers in my life and have diffidently observed a correlation between moldy washers and customers that always left the temperature switch on the  warm-warm setting. I remember a GE FF washer that the lady never used anything but WW and low agitate and spin speed the machine was not even six years old. She called because it wouldn't spin or agitate any longer, when I lifted the lid it was the most interesting mess I think I ever saw, the whole area under the lid was pink and black, it looked like an interesting science fair project out of control, LOL. I moved the washer away from the wall and the machines problem was immediately apparent as there was a big pile of black dust from what used to be the clutch. The washer got an entire new clutch and motor assembly, it was too far gone, thank goodness I didn't have to raise the washers top, when the machine started leaking a few years later we replaced it with a new WP DD that only gave cold rinses and I continued to work for this customer for many years and the WP never got moldy.

I know this is just one example and there are other factors in play here, the main one being the customer never left the lid open and because the GE FF washers top being sealed to the outer tub they were always more prone to getting stinky. And one case is not scientific proof but the same customer, same detergent, same water conditions [ always used liquid Wisk ] same laundry habits, but very different result.

While you are correct Mark that the washer will return to room temperature within a few hours after use a warm rinse still gives the machine and the clean laundry sitting in the washer a big boost in bacteria growth. Unless the load was bleached pretty heavily there is always going to be a lot of bacteria left in the laundry and it starts growing the minute the water in spun out and doesn't really stop until the clothing is dry. And while you have probably never left laundry sitting in the washer after it stops, this is not the way most American Families function these days LOL.