Why did Swain get buffed?

I'm simply writing this post because I'm just wondering, why did Swain even need to get heavily buffed like this? He was already in a decent position, if not being good already. Now it's just he's abusable and I don't know if Riot even intend to nerf him already the next few patches. Like for example, grasp on Swain early levels doing excessive damage? Do Riot only buff champions from listening to low elo players on these forums or what?
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