story
The latter was only possible because it was originally shot in film, yes, but it was also an incredible amount of work. They needed to reassemble every episode from film!
However, some studios put very little effort into their film to HD transfers. Last year, I watched Buffy, the Vampire Slayer on Disney+ and its transfer from film is woefully bad. For certain scenes, the picture quality looked like upscaled standard definition and these transitions were very jarring. Also, whatever filter they used for grain removal made the flesh tones and facial features look “wrong”.
Even worse was the wholly unnecessary conversion from 4:3 to 16:9. The resulting composition of many scenes was distractingly bad. At one stage, they the second camera unit can be seen filming the action from the side!
Edit: Fortunately, Disney+ have made The Simpsons (another transfer from film) available in 4:3 – as well as the default 16:9. There’s a setting in the UI to play it in 4:3.
https://www.slashfilm.com/549088/star-trek-voyager-deep-spac...
But ds9 is not as popular as tng, and I think fewer of the effects where done on film, so it might bring in less revenue but may be even more expensive to remaster than tng.
Some people redid some ds9 battle scenes on YouTube and they look awesome. There’s also some remastered footage in the de8 documentary (I think “what u leave behind”?)
Makes u dream a little