I'll let the devs jump in and correct me if I'm wrong, but here's my understanding: The goal of ranked PvP is a little different than regular PvP. It's very much about the team effort, not individual contribution. So, we didn't want to encourage people rushing in the try and get the best # of kills. Instead, we want players to focus on putting their best foot forward to contributed to overall wins. Not just kills.
Hope this helps!
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