Most early registries are probably already in use. For example, there is the Texas class (NCC-900), Burke class (NCC-301), and of course, the Saladin class (NCC-500), not to mention Masao's designs, such as the Wasp class, Gagarin class, and Asia class.
Also take into consideration that all ships after the Romulan War probably utilized technology from the Vulcans, Andorians, and Tellarites, after the formation of the Federation, they are probably going to look quite different from the NX-class, with a few exceptions. A few might share a few similarities here and there, but that aside, I prefer to see the similarities of the vessels already invented.
Also take into consideration that all ships after the Romulan War probably utilized technology from the Vulcans, Andorians, and Tellarites, after the formation of the Federation, they are probably going to look quite different from the NX-class, with a few exceptions. A few might share a few similarities here and there, but that aside, I prefer to see the similarities of the vessels already invented.