The big thing is that the canon Connie was designed in a less critical pressure environment, and therefore could afford to be a good enough fighting ship and a "kinda okay" everything else ship, but this ship, as a consequence of its different threat environment and technological availability space, isn't going to be able to do the same kind of cruiser stuff you describe particularly well, because it's not designed for that; it's designed to be a big mallet for smashing D6s and D7s with. And as it is reasonable to assume that Starfleet is not stupid, I don't expect that a design like this one that isn't designed for those kinds of long range operations to be used that way. Frankly, I honestly expect that the Kea is going to end up doing that until such time as we replace it,