Considering that the name of this class of ship inspires the thought of a Diplomatic Emissary...
Perhaps it was felt during it's (in-universe) design process, that having the photon torpedo launchers so obviously seen, could be a detriment to it's mission goals.
Therefore, the designers hid them away behind a movable panel.
It wouldn't be the first time this thought process could have been used, as according to the actual production designer of the NX-Enterprise (Doug Drexler), this was purposely built into his design of that particular ship.
Form follows Function.
DaveyNY - STO Forum Minion since February - 2009
................Star Trek Fan since Thursday Sept. 8th, 1966
There are No Longer any STO Veterans... We're Just Minions who have Played the Game for the last 4.75 years.