2016 Winter Tournament: "Frozen Heart"

Let's be honest, not everyone actually follows this rule about repeating moves.

I absolutely don't understand this position. The logical position is that if there's a connection break or a client crash, the game state should revert to the point of the interruption. I don't understand why one of the players should be allowed to proceed differently. Even more incomprehensible are arguments like "well, you can't check it" - should we allow opening tournament saves based on these arguments?