is it though?

• kettle: fill it with water, turn it on, and wait
• stove: fill a pot with water, put it on the stove and turn it on, wait
• microwave: put a cup of water in the microwave and wait
• coffeemaker: press the go button, it makes hot water

it's useful in the same way that a rotary hammer drill is useful for drilling through masonry, i'm going to assume you probably don't drill through much masonry in your life, therefore you don't need it.

Americans aren't stupid or daft, we just dont fucking need them. 95% of the time we need hot water, its for cooking, or coffee.

If we had a kettle it would literally just be landfill.

you're effectively asking someone who doesn't eat toast frequently why they don't have a toaster, it's a silly question.