Daniella stated: source post
the fact that they're all "skills" says enough about the perspective of whoever came up with it. they probably see intelligence as something that can be "worked on". it's definitely a more egalitarian definition. i'm not sure where people get the idea that it HAS to be 100% genetic, when IQs (just an example) have been shown to be affected by the smallest things outside of genetics.
Well as to genius being something that can be "worked on", your IQ is expected to increase over your lifetime.
I see what you mean about the theory of Multiple Intelligences being fair or "egalitarian".
After all, my professor joked that we would all get As and trophies. That is, since most of us were the Millenial Generation, and you know how the millennials easily got trophies for everything.
I think success is not directly related to IQ necessarily but rather a combination of tenacity (steadfastness) and perspicacity (focus) as I said above.