I'm curious why Jhin's ultimate needs to slow?

I feel like Jhin's kit is a little overloaded. It got me wondering why each of his ultimate shots slow the enemy who gets hit. It seems like the chances of him hitting shots goes way up if he hits you with any of them. With his theme being a sniper, would it make more sense to not slow? He should have to be more accurate, especially with the last shot, since he can engage from so far away. His root already offers CC and the traps offer a slow to set up the ultimate. Just curious what others think about this.
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