I've seen it before and it *can* work well. It's used when there's no "protest committee" (or TD) on-site, and where they don't want to bring the teams back to play another day.
So, the coach is given 10 minutes to find the rule in the book, without this action being seen as "showing up the umpire."
And, yes, it's not perfect -- the umpire can refuse to believe what's in black-and-white, or the correct ruling might be based on some interp that's not in the book (or not clear in the book). But, it can help.
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