I think maybe Pubert is referring to the myriad variants of the Miranda class, each of which could be argued had a specific mission configuration. I forgot how many we've seen - 7 or 8, probably. I put together a comprehensive list in another thread a year or two ago on that topic. There's also the 3 or 4 Nebula variants we've seen out there. But yes, the Oberth definitely seems to have been a one-size-fits all platform, which is a shame since there are a lot of cool fan-made variants out there that could have been used on-screen with minimal effort to imply different mission profiles.
Because TNG was infamous for recycling movie models, the three main ships (Excelsior, Reliant, Grissom) were used even when they logically should have been a different type of ship. In the case of the Miranda:
1. Reliant: survey ship/front line warship, as shown in TWOK
2. Lantree: supply ship with 26 crew
3. Brattain: science vessel with 35 crew
4. Saratoga: unknown function/non-front line warship (families aboard, etc.)
(I'm not bothering to list the class's appearance in later DS9 because it was just representing generic Starfleet vessels.)
So we have at least three distinct mission profiles of what is essentially the exact same ship. So there's more evidence that Starfleet
doesn't build ships for a specific type of mission. Ergo, those Inquiry class ships, while being used as warships at that point, could easily have been used as science vessels for some other mission. That's the way it's always been in Star Trek, even with the original TOS Enterprise which was used as a science vessel, a warship, an exploratory ship, etc. etc. etc.