E;R's argument is the best counter to that kind of thinking. It doesn't matter if you "explain" why she's better than everyone at everything. The fact is, hypercompetence is bad writing because it takes all stake out of anything that character does. I don't care if Rey found the Gomu Gomu fruit and then gravity trained for 5000 years, she's still boring. An explanation for why you made an overpowered, boring character doesn't make that character interesting.
E;R's argument is the best counter to that kind of thinking. It doesn't matter if you "explain" why she's better than everyone at everything. The fact is, omnipotence is bad writing because it takes all stake out of anything that character does. I don't care if Rey found the Gomu Gomu fruit and then gravity trained for 5000 years, she's still boring. An explanation for why you made an overpowered, boring character doesn't make that character interesting.