Uh, no? Almost all of them have unique visuals. Some don't, such as the Solanae Set from A Step Between Stars.
Correct. Almost all special space sets have some visual work with shields being the bare minimum. Solanae Space Set is the only special set that has no visuals. The last rep space set, 8472, has visuals also. Even the much maligned Breen Space Set has quite a bit of visuals.