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...So I can stop trying to play champions like Jax or Kayle when I have an itch to do so. I know I either can't play a champion, or it's just a bad champion. LeBlanc is by no means a bad champion, but she trades too much late game for early game power - so even a 7/2 LB can be useless by 40:00.
It would just help in fighting the temptation of getting a champ because "I might learn him this time". Sure sometimes it works (like I learned how to play Kennen better), but there are champs I should never play (like Ryze) and I still try to.