Re: Unused Cardassian/Dominion shipyard
I dunno, that seems way to seamless how it incorporates both Jem'Hadar and Cardassian designs. I'd see the Dominion deliberately building only Jem'Hadar facilities and "phasing out" the obsolete client state's designs along with their military and any threat. This was also demonstrated with how Weyoun was clearly letting the Cardassians soak up the casualties during the war.
"I was never a Star Trek fan." J.J. Abrams