I think this is a great preventative step. I have a side load washer and dryer and I have to keep the washer door open between loads. Other people I know got a similar machine and never did. Those machines smell like mold and they wash their clothes in it still. Eww.
Meanwhile I've had mine for 10 years and it is still working great. We run the clean cycle when it tells us, but the preventative step of "letting the water evaporate so mold doesn't grow" is a great one.