Macbeth

Imagine how the plot, theme and tone of Macbeth would be different if Macbeth could gain more power by becoming good at something or learning something, rather than benefiting through another's loss. 

Macbeth in the play, just like the prompt says, gains power from another's loss. With him becoming king by doing something courageous or brilliantly, yes absolutely he would have a completely different insight on "life" itself. By having something positive impact your life, you honestly have a different look on things surrounding your attitude/morals. What if a huge dragon came and conquered the whole town while killing the king? What if Macbeth killed the dragon and saved the world? He would inherit the throne by earning it and would give him and most importantly Lady Macbeth a more humble attitude with their "ego". Let's keep in mind this is one Shakespeare's tragedies and nothing works out in good thoughts.