Building Fighters has no tradition in Star fleet. While most ships are designed to fulfill a variety of missions Fighters and Carriers are contrary to the very roots of the Federation and Starfleet dedicated Warships were not designed until the DW (not counting the Defiant Project). Even the PDF Vessels like the Saber, Akira (serving as a small time Carrier IIRC), Norway or Steamrunner vessels were well rounded ships that could more than deliver a good punch.
As for the Kit bashes - i am personally reviled by the idea to cobble together a Working Starship by piecing various available parts together. These ships are probably plagued by a dozen design flaws and are plagued by all problems rushed production brings along: Malfunctioning equipment etc.
The main difficulty with fighters in Trek is that it's about power plant, not just maneuverability. The phasers you can mount on a fighter are going to be way less powerful than is necessary to affect a larger ship without sustained fire, which is why you only saw giant swarms of them in the battle scenes.
I agree Unless they field Photon torpedoes their impact is going to be minimal. And even if they do the Fighters don't have the ability to stay in the field for a prolonged fight And a lot of personal is probably doomed if the Carrier goes down in flames and the scattered fighters get hunted down by expandable Jem' Hadar fighters.
I think fighters at least in Trek are a waste of resources.
And speaking about Fighters in BSG their usefulness against capital Ships is doubtful as well. If The Galactica fills her surroundings with Barrages that could wipe out even friendly Fighters by incident. A attack run against one of these behemoths is equals suicide
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