I won't go that far.
I will say stubbornness is not the right way. Adapt.
Is that not objectively true?
Steve Kerr's resume is one of the best in NBA history for a six year career. I'm not saying he's a bum but his resume is greater than his abilities and people like him are often shielded from criticism based on accomplishments which aren't fully theirs. He's not indispensable. And if a fifth of his teams games could be argued to have been lost because of him as you asserted, his job security should be an issue.