I see.

[ She folds her arms over her chest, humming rather pleasantly in agreement. Then again, Mion is rather skilled at games so she gets what Nanami means by having your opponent understand what's going on if things keep repeating too often. At least it makes things interesting! ]

I get it. You'd have to mix things up and keep your opponent on their toes! By making sure they can't read you, it makes it easier for you to win.