A lot of houses are older than the concept of central heating or running warm water, so there are some homes that don’t have central warm water, but instead small heaters under the kitchen sink/next to the bathroom, which might or might not hook up to dishwashers
It also only matters when your dishwasher is hooked up to warm water in the first place. (In Germany) I’ve only ever seen them connected to cold water.
Running your faucet only makes sense if your dishwasher is also hooked up to warm water. (In Germany) I’ve only seen them connected to cold water.
You must be new to humans if you think if there’s a limit to stupidity