While I think it’s cool to have access to I agree with your point here. I’ve done a few listening experiments with files purchased from Native DSD and although the artists and recordings were excellent the results weren’t appreciably better than well produced Redbook titles.
In my listening tests the differences were small but they were audible (on my equipment). But to my point above- I did not have the same title available on CD for comparison at the time nor did I bother to take the DSD 512 file and downsample down to 16-44.1 for direct comparison. I did downsample the file to 24/192 for playback from my server and the quality was still very good although the file sizes were still extremely bloated compared to a ripped CD.