As for the deployment cost of the Odyssey (vìs-a-vìs the Onslaught), it's following the high-tech philosophy of "it likely won't take as much hull damage and it can engage/disengage way better than slow bruisers." With 80 speed, two flight decks, a really deep flux pool and good shield, I think it falls in line with that design pretty well.
Not sure about that. Flux pool is good, but not as good as Conquest. As for shield, if Odyssey kept 0.8 shield, I would agree, although it still was not very durable to begin with, especially if you need that flux to attack things. At 1.0, it would be no more durable than Aurora.
Two fighters bays but no additional OP to support that? Unless Talons are still overpowered for their cost (despite getting weakened), that would be hard to afford two good fighters without sacrificing something. I already eschew medium missiles to get what I need to make Odyssey somewhat decent.
P.S. I agree with Hiruma Kai's earlier points. I expect what I pay for, and if Odyssey costs more to use than Onslaught, Conquest, or Legion, I expect Odyssey to be on par if not outperform less expensive capitals somewhat in overall combat performance.
That said, with skills, Astral is the most powerful ship in the game of 0.8, and it is cheaper than Paragon. (Yes, I know skills, some overpowered fighters, and Unstable Injector will be weakened.)