Not a gimmick but something to watch out for is the wear and tear that shortens the lifespan on your washing machine
I've just replaced my ten year old washing machine and it was put to me that their not designed to do 4 or 5 washes one after the other
Something to do with letting the machine cooldown properly after each wash before starting the next one
This is my third washing machine in this house, the first lasted 15 years the second 10 and the installer reckons that this new one will only last five or six years, which surprised me a little and hoping to prove him wrong
I should also add that I had to replace the immersion as well, which I can only presume that after 16+ years of non use didn't like been left on for 8 hours a day once a week