You see the argument about how the dreadnought should not exist in a lot of threads concerning the Galaxy. This thread is for posting theories as to why we have it in game now (in universe reasons, not the real life money reason), not about why it shouldn't be there.
My theory:
My thoughts on it is along the lines of this being a Dominion War era refit that didn't see fruition until after the war was over. We know there are several examples of this happening in the real world. Several types of ships, fighters, bombers, etc that had development started during World War II, but didn't quite see service in time to see combat.
My theory on the need for such a refit comes from the loss of the USS Valiant, and Starfleet realizing it had no single ship that could stand up to a monster like that Dominion battleship. Since we already see in the tech manuals that development on such a large ship takes years, they decided to upfit an already proven, and large, spaceframe. We even see what could perhaps be some of the early refits towards the Galaxy-X with the USS Venture, since the Venture and the Ent-D refit both have the additional phaser strips on top of the warp engines. Seen
here and
here.
I would further conjecture that in the alternate timeline, the Enterprise D survived that timeline's Dominion War, but in the process was so badly damaged as to be mothballed instead of repaired, given material and personnel shortages during wartime. She was only saved from the scrap heap by a Riker with enough clout later on to have her repaired, and brought up to 'new' Galaxy class specifications in the process.
Purely speculation to be sure, but it fits to some degree.
Thoughts on this theory? Your theories? Remember, this is a thread about in universe explanations for why we have it, as it is obviously part of this game's timeline.
Comments
I don't need an explanation why the ship is here, it' pretty self explanatory, we are at war.