This likely gives them confidence that if they were to remaster for a different color-space or higher resolution, that they could. For a 4K original shot in 8K, Netflix could send it back through the production process for a more reasonable cost and be able to launch the title quickly. I'm surprised they don't ask for VFX sources to be archived though. ST:TNG and Babylon 5 both suffered badly from loss of the origina…
Yeah, Star Trek (VOY/DS9) suffers really on Netflix - I wonder what they chose as source - straight DVD rips? The intro of VOY, for example, has weird color artefacts when the deflector dish of Voyager flies by the camera.