The material that I find (on closeups anyway) that dates a lot of this stuff is the very visible texture of what I guess is fiberglass casting. There's a closeup early in SFS where somebody on a klingon ship plays the genesis tape, and the slot they drop it into has got that textured beaded look that just shouts cheap cheap cheap to me ... I mean, I have used discarded hallmark racks as set walls in zerobudget shows that don't reveal such an old-fashioned look.
Yes, yes, a THOUSAND times yes. Well said.