Miranda with two shuttle bays and no deflector dish could be designed as low end of the mix, meant to fill more pedestrian missions and produced in quantity to fill out numbers for the star fleet in case of war.
Welcome to the BBS, and although I read in another thread that you don't like the idea of starships performing mundane cargo transport duties, I can't help to remind that these openings at the stern of the Miranda Class look anything but shuttlebays compared to the visual design language of shuttlebays from the TOS Enterprise
to the Voyager
I think these are inserts (and exterior connect hardpoints above) for cargo containers, but by the 24th Century Sisko's Saratoga
obviously uses this space for shuttlecraft (just as I use my garage to store bikes and junk but not what the garage had been originally designed for).