If there are supermassive black holes at the center of most galaxies, why are there not massive stars at the center of galaxies as well?
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Stars can only get so big.
The more mass a star has, the more energy it generates. The more energy it generates, the more powerful the solar wind and photon pressure it emits.
The largest stars several hundred times the mass of the sun emit so much energy that they start shredding themselves. The intense power from the core peels the outer layers away like a cosmic onion and the star can grow no larger.
How supermassive black holes millions of times more massive than that formed so quickly (or at all) is still a bit of a mystery.
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