Though I disagree with the notion that one can to rule them all just because some argument about mastering, I do believe the "ultimate can" is an extremely neutral unforgiving one. But beyond that, I do feel that sometimes, headphones that "color" the sound to fit certain genres better are a good thing and nice to have.
@Manveru I'm not saying I have to have a can for every single genre....that IS silly. But because their are very powerful extremes in the sound of music across the board of it all, tt can be necessary for people like me to feel the need for multiple headphones to please them. To further add into that, there is the whole idea of just simply loving how a certain headphone sounds with some things and how one may sound with others.Sometimes there is no better, there just is how each does things differently and there is something to be respected about that and how some folks have that issue. You don't have to have 20 headphones for that, but I can understand why some have 5 or so just because they enjoy how certain cans treat certain songs. Maybe there is a more balanced option out there for those guys, maybe there isn't. Until it comes to fruition, the best choice is to have more than one can.
I wasn't talking about you, just thinking aloud about generalities.
More general thoughts:
I've never understood the idea of "unforgiving" either. The idea that some headphone is "so good that it makes bad recordings unlistenable." IME, a good headphone is...a good headphone. By the nature of what it's supposed to be it sounds good. Everything you play through it sounds better compared to a not as good headphone. Besides, a bad recording is a bad recording. It doesn't become any better or worse a recording if you play it through different gear. To me, bad recordings sound a whole lot better on the AD2000 or the Paradox compared to not as good headphones. In fact, I would say that a good headphone makes bad recordings more listenable (or should I say "bearable" depending on how bad it is).
Then of course, speakers seem to make recordings that sound awful on headphones sound amazing sometimes.