Macbeth Question

If Macbeth could gain more power by becoming good at something or learning something, rather than benefiting through another's loss, I feel like the story wouldn't be as popular in Shakespeare's pieces because I feel like the whole plot, theme, and tone would be so different. What would the purpose of the story be? What would be the theme? How would Macbeth be perceived? I feel like Macbeth would sort of be the best good guy out there and he would really be looked up to.