Can anyone explain to me why they decided to change zed?

Considering he is a fairly balanced champion right now what they give him sounds like a buff to me. I mean there are champions out there who desperately need tuning and riot is not adressing them but they address one of their most balanced champions right now. What about nasus? Why is he not getting tuned already? Why touch the balanced champions and not deal with the broken ones first? I need an explanation for this decision Because to me it looks like they are not putting their time to good use. Don't fix what's not broken
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