Which isn't canon by any means. Where the ship could hide all those torpedo tubes is debatable, and the studio cgi model itself obviously only has 3 phaser arrays - 1 on top of the saucer, 2 on the bottom (which would be 1 if the hull wasn't in the way).
The ship could have that many launchers because torpedo tubes are easier to tuck away in greebles and recesses. Phaser arrays, however, are a lot more prominent and need clear lines of fire.