Why give irelia compensation buffs early game?

What is wrong with just flat out nerfing a champion? Why give assassins buffs when duskblade was nerfed? irelia was already and is already really strong and has one of the highest banrates, can you not just do what you did with zoe and give a massive nerf once and for all and THEN later on gradually add back buffs? A champion being strong is way more annoying than one being a bit to weak, since there are so many champions who are way too strong compared to the number of bans available.
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