Bajor was not an important strategic post
...Except a few episodes into the first season, we learn that Bajor in fact is the most important strategic post in the universe short of Cardassia itself. No, not because of the wormhole. Forget the wormhole, destroy the wormhole, Bajor still remains the strategically most important piece of real estate in the universe - because it is the next-door neighbor of the Cardassian home system!
Supposedly, the Cardassian Union features a large number of systems (whether colonies, outposts or conquered worlds with native populations, we never learn), and extends far away from Cardassia Prime in many directions. Not so in the direction of Bajor! The Bajoran system is the only one standing between the capital of the Union and neutral space. Giving it up and allowing it to become part of that neutral space seems like an inconceivable strategic blunder.
Which may be the very reason the civilian government gave it up: it was blackmail with the highest possible stakes. "Heel, Central Command, or we will never let you have Bajor back!"
Of course, at that point, "letting CC have Bajor back" would have been but a minor formality. Nobody could predict the UFP would take an interest, let alone that the UFP would refuse to leave when the Cardassians came back.
A minor bug for me is just how little of the above work appears to affect the running of the station or is shown on screen. Presumably the stations fundamental power systems and infrastructure would require gutting out and replacing with federation level technology to support those much more powerful systems.
Good point - but it could be argued the station's refining processes called for it to have a massive powerplant already, and none of those processes were running any more. Furthermore, a large part of the volume of the station would have been idled as well, now that the ore and the products no longer were flowing; upgunning could proceed behind closed doors, yet right next to preexisting power sockets.
Timo Saloniemi