As far as the whole Romantic cult of the individual, it wasn't as selfish as it might sound these days to lefty-intellectual types. It was in part an outgrowth of Rousseau's passionate individualism that emphasized
choice, the chance to metaprogram yourself free from authority... which was a revolutionary concept meant for everyone. Kant's Idealism was also an influence, in his point that we can only understand life through our own ideas, because reality is ultimitely unknowable, so in the face of the ineffable we then engage with our own perceptions, and freely and reasonably make our own judgements. It wasn't all naval-gazing, some of it was an outgrowth of the more progressive intentions of the Enlightenment (a period I couldn't give two shit's about personally.. but find the themes and spirit of the Romantic era intoxicatingly on point).
As far as Genius, I don't know if I exactly like the word, but I do think that people are obviously gifted in different areas, tend to be more gauged towards different fields of understanding and skill, and I don't understand this need to deny that some people are just more naturally talented at some things... and have more curiosity, drive, desire, imagination, vision, etc... than others. I don't think there's any need to take offense because talent can't be resolved in the scheme of this levelling, antihuman, Socialist belief that NOBODY IS SPECIAL, THERE ARE NO GREAT THINKERS. I think scenius is one of the engines of cultural progress, but even these zones are ultimately moved forward by talents and tastemakers, and as for lone auteur artists, eccentrics, benign egomaniacs, etc; they play an important part too, and life would probably be a lot less interesting without them. Romantics themselves weren't actually antipopulist though, they valorized folk cultures, and today they'd perhaps champion any folk scenes that propagate counterintuitively (by folk I mean grass-roots, localized, scene-based movements). The values listed in the original post, to me, are more the sentiments of the worst kind of Rockists, ones with small imaginations and narrow tastes.*
Also, this idea of an artist that follows his/her own muse without regard to how people will receive it... well, popularity shouldn't be their
primary concern if that means lowering their standards or being less inventive; but it's also hard to imagine their work being considered Great Art by anyone's subjective definition if it doesn't connect with anyone beyond the artist. But extremely personal art can be the most universal. And there's nothing wrong with a gifted artist pursuing their own ideas, it's actually very important. If you have a committee or PR team trying to whitewash the vision to make it dumbed-down and safe enough for an audience that they assume is stupid, well you get Post-Grunge or Mall-Emo or Walmart-Country (and thank God for artists that "know better" than what the masses think they want, take for instance
this experiment where some dudes tried to make a song based on a survey of what The People said they want in music. Heh.). That doesn't mean that pop factories haven't churned out great, 'culturally important' art, but obviously there was a level of inspiration that managed to survive intact through the creative synergy of the production team/writers/vocal trainers/performers. And crucially, somewhere in there were great talents... gifted writers and producers and designers, who were the real artists in the process. Where does talent come from? Dunno. Is there something almost seemingly mystical about the creative process? Well, yeah, and trying to deconstruct it rationally seems pointless and utterly impossible. That's why Romantics prefered allusive, koan-like Fragments, or art or poetry to try to express their emotional reactions to the Sublime. I do too.
*edit: this wasn't meant as a dig against the poster but the ideas he was critiquing, hope it didn't come across that way...