So why should woman focus on tech industry jobs? It seems to me that there are a lot of very well paying, purposeful roles in law, medicine, finance and education that woman have been very successful in and are in fact dominating in leadership. 

The reality is that many tech jobs have extremely long hours, don't actually pay that well, are very transient, and are routine. Perhaps the 'problem' is that women are smarter than men and feel that jobs under those conditions aren't really worth the aggravation compared to the opportunities that are available to them.