Can someone explain why Shaco box was changed?

Like I get that it was a while ago, but every so often I am reminded of it. Did anyone ever say, in the history of league, "Gee I wish they'd Nerf the box so it wouldn't prioritize champs." I mean the change was back before they explained their decisions, I'm just curious why it was even on their radar, let alone why it made it to live. Literally the only summonable unit to do it, seems kind of stupid to go out of your way to purposely be inconsistent.
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