Bruh magneto was capable of shaking the whole planet if went all out. I think that would be too much.
That's the thing. Kid doesn't have magneto's powers. Yes they both have magnetism, but the magnet fruit doesn't offer power on the same scale as that of magneto's. Its power is much more limited.
Despite having mastered his fruit to the point of awakening, the magnet fruit did not grant Kid massive island level AoE like the ope ope no mi or the Gura.
The true strength of the magnet fruit seems to be the fact that it can be used to create structures instantaneously. Basically the thing Kid is already doing. You can use it to build mechs and powerful weapons like the rail gun. The ultimate mastery probably involves making weapons of mass destruction, like the ancient kingdom robot, or Imu's UFO.
Also Magneto had speed advantage , Kidd is slow.
He's not. His speed is on par with base Luffy's.
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Anyways, hot take, its actually Kaido and Big Mom. They actually do have broken DFs, but never fully mastered them because they were born with abnormally strong bodies and haki, and hence they never unlocked the full powers of their DFs.
They never got awakening
They never even used their powers to the full extent of what they were shown to be capable of. Like Kaido could casually lift onigashima using the flame clouds, yet this power was literally never utilized in battle beyond merely being used for flight.
Kaido and BM both also barely combined their DF powers with ACoC.
Oda had them nerfed by plot so that they could be defeated.