Look, before trying eq, everything sounded natural to me and My brain was used to the peculiarities of my hearing but:
After eq, by headphone and hearing test, I at once realized that there is sound of cymbal and lot more in Al Jarreau Roof Garden which I did not hear before and,... I like cymbal sound.
Same would be true if my hearing was perfect but my headphones had recessed higes.... after eq there will be cymbal.
Problem is, with existing methods, once you adjust every given frequency to be heard, because of insufficient samples and/or algorithm result needs to be manually, or better to say, by ear, adjusted for pleasant result.
I am just laic- amateur/spectator here, don't take my opinion too seriously but I like idea, program and this small wired community.