So. Like. I love the defiant. It’s one of my favorite fed ships. It’s unabashedly designed for a purpose that Star fleet still does not want to admit they fill the role of.
It’s simple, spartan, and densely packed.
What it is not, however, is built by an engineer.
Any half-decent engineer with access to replicator tech would have designed the ship to at least be able to spit out its own parts.
(And probably, just maybe, to self-repair itself. Possibly using a singularity core for a power source so all it is now is a question of mass.)
Also, can we mention the seatbelts? And surge protection?
Bashir: “Oh look. Seatbelts. It only took them a decade to read my analysis of shipboardninjuries….”
<Sisko Glare>
O’Brien: “look, don’t blame us. Every prototype, seatbelts come standard. But apparently ensigns are less expensive because they remove them to keep the cost down.”
<Sisko’s glare changes to miles>
Bashir: “what?! That’s barbaric!”
O’Brien: “Don’t even get me started on surge protection circuits for the eps conduits!”