Same layout as the VA Defiant, so this is not a complaint that's new to the fleet version. For me, it's not a complaint at all. I find it neither wasteful nor useless. Then again, I don't mind being "forced" to include a beam bank and torpedo launchers. I'd put a Tactical officer there even if it was a universal slot.
With that layout, I am able to run:
Beam Overload III, Cannon Rapid Fire III, Torpedo High Yield III. (alpha strike)
Beam Fire at Will I, Cannon Scatter Volley I, Torpedo Spread II. (crowd control/secondary attack)
So, with a third Tactical bridge officer, I can also have Torpedo Spread I for the aft launcher as I pass the target, and still have room for Tactical Team I.
Pretty versatile, and I almost always have a little something extra for a target.
Weapon loadout, if you're curious:
Antiproton Dual Heavy Cannons Mk XII (anti-Borg) x 2
Antiproton Dual Beam Bank Mk XI x 1
Quantum Torpedo Launcher Mk XII (anti-Borg) x 1
Antiproton Turret Mk XII (anti-Borg) x 2
Quantum Torpedo Launcher (the Regent version with 180 degree firing arc)
Sometimes I need DPS, sometimes I need burst damage. Not exactly a focused, specialized build, but I can usually BS my way through most tasks that way.