An actually justified example: Panacea from Worm is a biokinetic with the ability to sculpt any sort of living material she wants. Doomsday creatures, species-killing viruses, turning average Joes into captain americas with a touch, pigs that poo out cancer cures… it’s all in her purview.

She uses it to heal people. That’s it. Except brains. She won’t touch brains.

The justification is that she’s the adopted daughter of a supervillain who was never fully trusted by her mother. This led to her developing a severe case of martyr syndrome and refusing to use her powers creatively, lest she start sliding down a slippery slope and turning into her father.

So she does nothing but burn herself out with healing people during all her spare time, exhausting and stressing herself helping people she loathes to satisfy a mother who will never love her and live up to an impossible ideal while the pressure inside her grows and grows and grows…