The Defiant concentrates Galaxy-class military technology into a hull stripped of science and civilian volume. Deep Space Nine would be better supported by several Defiants, numerous runabouts and fighters, and senior command for a station facing both the Maquis problem and the unknown beyond the wormhole. That package would support routine patrols around Bajor as well as a rapid response to whatever emerged from the Gamma Quadrant. Starfleet's peace-first assumptions left a critical position under-defended.
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Defiant as Starfleet's purpose-built destroyer
The Defiant is framed as the compact, explicitly military counterpart to the Galaxy class: a destroyer-like warship for an under-protected frontier base.