Besides the fact that I certainly believe there is an a priori line dividing the 'commoners' from the 'gifted', it goes without saying that talent alone will get you nowhere in any field where practical physical application is necessary and prior collective achievement simply imposes itself. However, you're confusing 'admiration', with 'recognition' for someone's achievement (which in itself invites a different kind of admiration). Of course you admire a truly beautiful woman, even if she was born that way and all she had to do was maintain that genetic gift by some discipline regarding diet and exercise. However, you admire the beauty, not the woman as a person, whom you don't even know anyway. Of course Beethoven wouldn't have been Beethoven without hard work, but that is a distant secondary consideration. There are so many composers that worked their lower intestines off for decades, but they couldn't hold the relatively lazy Rossini's or the 16-year old Mozart's-Mendelssohn's-Chopin's-Prokofiev's hats. You admire sheer inspiration and talent because they are rare; not because they are the rewards of hard work. Of course talent is moulded into artistic product through discipline, but this is the means through which talent achieves expression worthy of the talent. And I would agree that true artistic beauty is the perfect marriage between talent and discipline. However, with talent you can possibly find discipline; the opposite is impossible: Really hard work has often led to very mediocre, down to pathetic results (as can be confirmed by the hundreds of lesser composers during the last 400 years).
I know of no one that claims that artistic achievement is the mere result of genetic predisposition. In addition to hard work, luck and circumstance play a great role as well. However, if that initial inherent essence is missing, what else is there to be communicated - through whatever disciplinary process and fortunate circumstance - other than empty artifice; hard earned grant you, but empty...
Everybody got the same instruction in orchestration at the Conservatoire de Paris in Ravel's time. However...
Finally, I don't admire Wagner because he worked hard. If that was all, I would admire my father or a conscientious labourer in the same manner. I admire Wagner because of his finished product, which of course also involved discipline and perseverance; but discipline and perseverance are not what I primarily hear during Die Meistersinger, and certainly not at all when I hear the otherwise - puzzlingly - "unlearned" main titles to Cinema Paradiso. Everyone is different of course, but I'd rather have composed that track than all the magically orchestrated animated films, all the fugati in Jaws, you get my drift...