Charlie, I completely agree with you here. Nothing is purely genetic. In fact, in sprinting, there are probably numerous things equally important as genetics. What annoys me is when people neglect the fact that genetic factors exist for some odd reason without any basis.
And this should mostly be for people’s casual observation because you can’t do much at the moment to change one’s genes, so you may as well train the best you can as hard as you can. With the information available though, we can see some factors that may be important for elite level sprinting that could be focused on.