I really think it gives a minor advantage. Check this game for instance... (66025250) the final quater. Don't know much about the stamina of both teams, but the home team (team A) didn't get his prediction right. Team B did get one prediction right, but still got outscored by team A in the final quarter to finally lose the game.
The boost is noticeable, but mainly in the first quarter. Which seems to be an accurate simulation of a team preparing specific defence to other team often used moves. The team may be initially surprised, but after a while should learn to attack better the unexpected defence. The other side of the coin also works: THe team preparing the defence against a specific attack may be surprised by different tactic.
In the given examaple, the visitor team managed to win the first quarter, but no boost should stop a prolific inside attack against a mediocre inside defence. Given the ratings of both teams I think the boost may be too much, since 11 points seems very few, playing home, same effort.