GTCA is silly.  It has already been proven not to work.  This is not complicated people.  Stop destroying your reputations with these silly studies which can never be replicated because they are false.  The most heritable, whatever that means, things are eye, hair and skin color, and facial structure (35-40%).  By the time you get to height, too many genes are in play - sharply reducing any genetic association (16%).

There are some mendelian disorders capable of causing very specific outcomes but overall the variance in our genes cannot possibly be responsible for complex actions.  As you get more complex in the process, any chance of genetic relevance becomes very small because millions of identical genes are in play when considering complex actions.

On the other hand, over the last 100 years, we have exponentially increased in rates of complex disorders.  We spent billions thinking we were going to find the answer in genes.  The only thing we have shown, frankly, is how blinded we were by our prejudices.  In fact, NIH has stopped funding to find the genetic cause of complex disorders.  The answer is the environment.  Lead houses, mercury dumped into water, women’s makeup (most lipstick is coal burnoff), plastic, genetically modified foods, toxic contamination, pollution, etc.  Very low levels of exposure during pregnancy or early development, to a neurotoxin, can prevent the folds in the brain to develop properly, or for the myelin sheath to form correctly.