I have an electrict kettle and not once though of it as a "tea making device". There are dozens of reasons I might need boiling water and it's most often used for making coffee.

Another good use is dual-core boiling. When I need boiling water for cooking, I put some water in a pot and turn on the stove. But I also put water in my 2 kW electric kettle and will have boilng water within a few minutes.