We in the USA can't get as much power out of a wall, so boiling water with an electric kettle takes twice as long as in the UK/europe (same amp breakers, with half the volts (115 vs 230), means half the watts.
I think electric kettles are pretty common in the US among tea drinkers, but houses where everyone drinks coffee won't typically have one. Since most of the US prefers coffee, you don't get a lot of electric kettles.
When the element on my neighbors electric stove failed, the heating coil found its way through the insulator and the steel jacket. The electric current bored a hole through the aluminum pot she was using.
I didn't say anything about a bare, uninsulated electric coil being immersed in water.
The point is that this assembly is immersed in water; all the heat which escapes from it goes into the water.
This is not true of a stove top heating.