It’s also annoying to clean, and you need to cool it down before making a second pot. If you cool it down too fast, you’ll create a vacuum, and you won’t be able to unscrew the thing.
I am not sure it works on induction stoves, and on gas stoves, you often have to add a little steel thing to hold the pot in place.
It was a smart and cute little device when it was invented, but let’s be honest, it’s highly inconvenient, and it’s not making a particularly good coffee either.
To me, it’s not the coffee snubs that should be shamed, it’s the people holding on to a less-than-ideal device, just for the sake of nostalgia.