4K is also pretty pointless for a scan of a 35mm exhibition print - it’s definitely useful to have the scan at 4K, because of cropping and such and a 4K scan will be more detailed when scaled down to 2K than a straight 2K scan but for the final product, 4K would make practically zero difference - there could be a huge difference in detail if working with the o-neg or even an IP but not from a print - I experimented with this.

Actually, maybe taking the uncompressed files of the final 2K restoration and doing some kind 4K upscale using the advanced scaling techniques people have been using to upscale the GOUT might yield more impressive 4K results than working in 4K throughout.