Why isn't this Summer Showdown Attacker vs Defender choosing a potential VS Game Play option????

Watching players choosing defenders and attacker during this year's Summoner Showdown's been an eye opener for me.
Why isn't this already a Versus Game Play Option?
What am I missing????
Why isn't this already a Versus Game Play Option?
What am I missing????
Why isn't this Summer Showdown Attacker vs Defender choosing a potential VS Game Play option???? 52 votes
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Certainly looks like a fun game mode though, and hopefully we can see it in the game proper at some point