Is it extremely powerful though? The ship doesn’t begin its attack until after an inside job has been completed, not unlike in Star Trek: Generations.

You do bring up an interesting point with the lack of Federation ships being attacked. Though the BIA and the Bynar ship throw half a wrench into that idea. Not technically Starfleet, but not unaffiliated either.

My personal suspicion as to why we haven’t seen a Starfleet Vessel being attacked yet is because the Cerritos is ultimately going to be one of its victims… and that’s best saved for the finale. My second guess is that a Parliament ship will be a casualty. We saw a CGI model for the first time in the Ferengi episode, but the CGI models are typically reserved for fan service (Titan, Crystaline Entity, Voyager, DS9, Soverign Class), have a lot of use (Cerritos, Shuttles), or are engaged in combat (Bird of Prey, Sh’Val, Clumpship, Texas Class, Breen Vessel).

Also note the CGI Bird of Prey being added to the LD intro in S2, which foreshadowed the CGI battle in 3 Ships.

The Parliament class, to date, has not really fulfilled any of those roles—which has my attention in a conservation of detail sense.