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 original VFX.

The VFX elements for TNG were mostly kept, so it was mostly new post-production - it was DS9 that got bit hard, since there was much more CGI in the later seasons making an HD remaster too expensive.

I'll bet we see neural network-based upsampling (aka super resolution) being used for HD remasters in the near future.

Nobody's done this yet?