Here is what you get with a 2k film in 4k. You get finer noise from video compression artifacts and so what you see is closer to the uncompressed 2k version of the film. So you do get a better film experience with 4k. Even if the content is upscaled. If the goal is as close to an uncompressed film experience as possible, then a 2k film on a 4k disc and a 4k screen is the closest you can get. It is not pointless.

Also, The Phantom Menace is not from any 1999 versions. The 1999 digital version (nicely captured and share in 1080p) is more cropped and has different colors. It was rescanned for the Blu-ray and has different colors and more image. If there is any piece of the 1999 DI, it is likely the original pod race sequence that was released in HD. It is more cropped than the BR but it doesn’t seem as cropped as the DVD and EU HD broadcast.

And I would like to see if anyone can confirm the subtitles. If any of the films have burned in subtitles on them I likely won’t want the set. I want a capture of TFA from Disney+ because it DOESN’T have burned in subs.