Magma, when used correctly, is VERY different to the Human Torch, Sunfire, Firestar etc
She can't fly, she shoots magma and causes earthquakes, and she can travel by mixing with the magma underneath earth reappearing at another point of the planet. As in, in Age of Apocalypse there is a meeting of the Human resistance against Apocalypse, in Europe, suddenly an earthquake happens, and Magma appears from below to kill the people assembled there.
And in Decimation when MDay killed her boyfriend (he had fire powers, they were exploring a volcano, he was depowered and burned alive), she got crazy, had a mental breakdown, and reappeared in another latin american country, traveling thousands of kilometers underground, and she was causing earthquakes and eruptions.
It's almost like teleportation or fast travel by mixing with the magma inside earth, she can reappear anywhere.
Pyro is also very different from the others. He cant create fire, he can only control it, he can be burned, and his fire creations are solid, when he creates a firebird, it can lift a person and it continues to act on its own until Pyro destroys it or it's destroyed.
Many writers just don't do research. Guggenheim had Magma flying.