Thank you for doing this. I did something similar myself a while ago and arrived at the same conclusion. The only way it affected my editing in Darktable is that I realized that some modern lenses are just “too sharp” in the sense that they give me sharp details even when those are a distraction, so I now use a masked contrast equalizer to remove sharpness from regions which I don’t want to emphasize. This does give me a nice “pop”.
The bottom row says it uses a filter, what kind of filter and what did you test for?