those genetics will only be a factor among those receiving no teaching at all, or those who receive the maximum teaching possible. but they will hardly factor in in the middle of the bell curve where every genetic advantage by one person can be outdone by another one putting in more effort. the difference then between you and me will be that your genetic advantage will allow you to reach the same result as me with less effort. there is practically no benefit for you. or the advantage is so small that we won't even notice most of the time. if at all.
any model that relies on genetic advantages as a factor only works if we assume that those naturally more intelligent automatically bubble to the top and are not held back by other factors, all which have the potential to nullify any advantages they may have had
My garden grows based on light, CO2, macro nutrients, and water. We don’t say “CO2 is not a factor in plant growth because deficits in water, nutrients, and light can prevent it from showing in overall outcome.”
another reason why we can ignore a genetic factor is that we can not influence it. or, that trying to influence it carries serious ethical implications.
it is also to small to serve as a tool to predict future performance.
producing geniuses is not a billion dollar industry because we don't yet even know how to teach to that. but that doesn't mean that we could not improve teaching and peoples potential massively.
china used to have a billion dollar tutoring industry (ok, i don't know if it was a billion, but china is huge so it's possible) until a change of laws shut it down.
but this chinese tutoring industry was not aimed at producing geniuses. instead it was aimed at exploiting parents, extracting their money without providing any real value except putting pressure on the children to perform.
that's why it was shut down.