"In 1970s you would just create plastic models of spaceships and film them with normal camera"
Are you sure? For example, from the ILM history at https://en.wikipedia.org/wiki/Industrial_Light_%26_Magic we see:
1975: Resurrected the use of VistaVision; first use of a motion control camera (Star Wars Episode IV: A New Hope)
Following the link to https://en.wikipedia.org/wiki/Motion_control_photography gives us:
> The first large-scale application of motion control was in Star Wars (1977), where a digitally controlled camera known as the Dykstraflex performed complex and repeatable motions around stationary spaceship models. This enabled a greater complexity in the spaceship-battle sequences, as separately filmed elements (spaceships, backgrounds, etc.) could be better coordinated with one another with greatly reduced error.
That doesn't sound like a normal camera.
The text immediately before that quote is:
> The 1968 film 2001: A Space Odyssey pioneered motion control in two respects. The film's model photography was conducted with large mechanical rigs that enabled precise and repeatable camera and model motion. The film's finale was created with mechanically controlled slit-scan photography, which required precise camera motion control during the exposure of single frames.
And in Close Encounters of the Third Kind, the mothership was made of wood, plastic and metal, and wasn't cheap.
Now, to be sure these are high budget movies, but your broad description makes it sound like it was true for all movies in the 1970s.
I think a better comparison would be to look at the model-based special effects in Star Trek: Deep Space Nine with the CGI effects in Babylon 5; both produced at about the same time. Quoting https://en.wikipedia.org/wiki/Star_Trek:_Deep_Space_Nine :
> DS9 was the first TV show in the Star Trek franchise to use computer-generated imagery (CGI) for exterior space shots. Although a few other television series, like Babylon 5, were using CGI exclusively to avoid the high expense of model photography, the Star Trek franchise had continued to use primarily physical models for exterior space shots because producers felt models provided more realism.