alt Hacker NewsExactly!
I have to have a kettle for other purpose (including heating water for other mugs than mine), and no self-heating mug is going to be as efficient as a kettle to heat water.
Furthermore, I also put cold or room temperature liquids in my mug. With a self-heating one, I would be carrying the heating parts for absolutely no reason.
Same goes for a TV. By keeping things separated, I can decide what I do which each device and manage their lifecycle separately. If the device reading video files is included in the TV, I can't plug it to another TV or a projector or even take it with me to use it elsewhere. While I've upgraded three times my video playing device to follow tech evolution, I've kept the same TV to plug them in.
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But like, a coffeemaker is a thing.
You can make coffee with a kettle, but if you are making enough coffee often enough, it does make sense to bundle a second kettle into a dedicated coffeemaker, even if you are reducing the functionality of it by doing so.
I have a multi-purpose kettle that I can use to boil water, heat the room, cook a small amount of food, or use as a sand battery for when its cold in the desert, where the kettle is designed to operate as long as there is a handful of material to burn.
It is fair to observe a separation methodology, but I also have to say, in some cases multi-purpose devices have their place.
If, say, the self-heating mug involved solar harvesting, I'd put a couple in my kettle bag, for sure.