Nothing is everything. All is a blend of more than meets the eye. We never see everything at play in a given situation, and mindset is just a simple variable that plays its part in the grander scheme of things. Mindset alone, without the proper skills, from finance to life in general, is nothing.
But that doesn't mean it's not important. And constant improvement of your mindset is key. Along with your other, more practical skills.
RE: Mindset is relevant