#1- I know it is my own responsibility if I leave the washer or dishwasher running and it floods, or if I leave the dryer or oven on and it sets fire to the house- I'm not going to sue the appliance manufacturer. I don't usually think twice about any of the above- our appliances are all in perfect working order, the dryer has a clean duct, I do know things can go wrong. I would much rather take my chances, however slight, than only run the appliances when we are home and only get things done while we are at home babysitting them. Even so, chances are somebody is home or next door/across the street in case something should go wrong.
#2- A little water can go a long way, I once bathed our dog upstairs, and shortly after, had water dripping through the bathroom floor and into the basement- I was able to dry up all the water with a bath towel. The dog had gotten out of the tub dripping and shook himself off. No broken pipes, overflowing drains, or anything. Just a wet dog and an old home.
#3- No matter how much water you have, it will go as far as humanly possible, getting into every possible crack and crevice. Last spring, we had a bit of a mishap with our RV- After we flushed out the antifreeze, we closed all the faucets and walked away- not realizing the shower faucets were still on, but the valve was shut off to the shower head, closing off the majority of the water, but leaving a small trickle running into the holding tank. After about an hour, I opened the door, and water cascaded out like a waterfall. Lovely. The trickle of water had overflowed the holding tank, filled the shower pan, and poured out on the floor. Mhmm. We uses two carpet extractors to remove the excess, which had gotten into everywhere, including the cupboards, under the bed, and had begun soaking up the bases of the dining set. We borrowed a dehumidifier, turned the furnace on 80, and alternated that with the air conditioner. Three days later, the carpet was dry, and there is no trace of any wetness or odor left today. The reason is we acted quickly before mold and mildew could set in. Yes, water -can- cause damage, but we had none.