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Yeah, when I think of a cooker, I think of something that heats something up, not just keeps it going.

The stove with one burner dropped down [1] seems more practical, not requiring a separate device/extra step.

[1] https://krisdedecker.typepad.com/.a/6a00e0099229e8883301a3fd...

I wonder if you couldn't get similar efficiencies by insulating the walls and lid of the pot itself though (and that would work on any stove, not just one that had a sunken burner of a fixed diameter). Choosing a good material for high-temp insulation might be tricky (without making the wall thickness high) but I for one would be happy to have an nice Ti + aerogel pan... (Ti does work on induction too!)

less oven space, need to replace entire stove, made in a factory and not at home.

It is cleaner perhaps and more purpose-built. But I would not call that practical.

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