I wish they would have included at least one old Kelvin type.The Kelvin and her sister ships look nothing like the Starfleet vessels from DSC season 1.
Since the Romulan mining ship changed Starfleet's development and priorities, it would make sense, I guess that their fleet barely resembled the Prime universe from the Klingon War era. Assuming most of the vessles of the Disco era were either destroyed in the war, or found unfit due to that action and/or their performance, it also makes sense that a new fleet based on lessons learned learning heavily on Constitution and later Connie refit designs would also make sense.
But they still could have thrown fans a bone and had a Kelvin ship in there or even an old Daedalus. Maybe it was more difficult to do before the CBS/Paramount merger. Daedali have since made an appearance in Lower Decks