I don't doubt his passion, interest or hunger.
It's his ability to design that is unproven IMO. Which is why I keep harping on guys who develop their craft and hone their skills over time, then work their way to the top of their respective fields.
Like when Michael Jordan wanted to play baseball. Dude was phenomenal at basketball. And we heard he was really good at baseball. And believed like he did that because he was SO good at basketball, he'd excel at baseball.
And dude couldn't make it out of the minors. But he did start at the minors. He didn't just jump on to a pro team because of who he was.
He has been working on fashion extensively since about 2008, he has created & failed at two entire collections prior to the Yeezy line, He has created & designed items in the past that have been appreciated by masses of people & He's still developing. He's already proven several times that his designs whether they be his own (Nike yeezy, adidas yeezy line) or through his collabs with other designers that people are interested and want more.
all of these fashion houses have propelled people into positions of power who have just as much or less experience then Ye has had. I'm not saying make him the head of your company, but these same companies hire people straight out of university, who have literally have no experience and no proof that there designs will be impactful. Yet people will believe in that persons potential & allow them a lane to showcase that they can design things that the people will like.
Kanye has worked hand in hand wit Giuseppe Zanotti, Jean Touitou, & other designers to create things that have been celebrated and liked. It' not like these designers needed Kanye to gain some sore of relevance in their field, in many ways working with & designing things with him could be looked at as a negative thing. so for these top designers to sit with him and create with him they have to have some belief in his designs or else they would have never wasted their time.
Either way now that he has the Yeezy line available and can showcase his designs to the world, show that people do like and relate to his designs.