Not sure I've ever read anything about exclusivity in any of those threads. It might have everything to do with meaningfulness though, as people want their achievements and progress to matter again. It's also have nothing to do with "elites", as those are happily participate in it's use (though they're entitled to leave…
Thing is, I have a 2 Bar lightning set up - albeit with the same skills and weapons on both bars... I did it to prove a point, in that you could make the "broken" Oakensoul build without including Oakensoul .... Just being an Imperial makes me "too tanky" according to some..... etc I then put Oakensoul on a DK Firemage....…