Useless slow after usage of W from Blitzcrank

Hi Gamers, Why does Blitzcrank got the useless slow effect after his w ???!?! For example Draven jsut got the same spell and gets it refunded right after he caught his axe. The same thing with Lulu she got a movement buff and right after its gone she didnt got slowed. Thats jsut unfair. Atm its just hard to flee from enemys with this 30 % slow while other supps just get away you can stright stop the chase and can stay afk under the tower.
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