The only L was against the Lakers by 3 points. When the opponents shot over 37%, they were 2-4.

The league average of three point shooting is 36.2%. That is, if you shoot below league average from three in the game, your chance of winning against Magic is very small.

Against big-sized team like Magic, you either outshoot them from the perimeter, or get a lot of points off turnover. The Celtics have done well on the later, but 25% of 3pt shooting gave us little chance to win against the Magic.

There is a narrative that the Celtics rely too much on 3pt shooting. This is true, but in this game you have to rely on a serviceable 3pt shooting to win the game.