Romulan stealth technology actually being holographic projectors that make their ships "invisible" to the eye and normal light is fully believable
Only believable if we assume that no equipment on NX-01 can detect ship hidden with hologram so there is regress in technology from 2018 to 2150s. And we must also forget about Xyrylians and Sulibans and cloak technology in Romulan mines.
