Why is Rageblade being heavily nerfed?

Once again, Kai'sa is the only champion who is a top pick that builds Rageblade. https://www.op.gg/champion/statistics So why is Rageblade losing its onhit damage that scales with AP and AD and it's % increase of AD and AP on stack for 6-15% hybrid pen and 200 less cost, which is way worse? No seriously, it is worse.
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