One could also say 'we lose bright women because they would rather have babies than be dedicated to their careers'.
So you do recommend that policies be changed to be more flexable so women can have babies and not lose ground in the 'rat race'.
Other here have pointed out that fathers in these type of careers have been getting screwed in this regards since time began. For example, I saw my dad only a few hours a week and as his company took off less and less (a few hours a month!). In other words a man at Harvard that has kids has to decide if he wishes to spend time with the kids or go for tenure. Is that fair? What changes in the policies can be made so he doesn't have to make this type of choice?
HEY, I don't have ANY specific viewpoint here. Really. Of course it would be best for the society at large to utilize these bright women. HOW this is done in a way that is 'fair' to everyone? I don't have any answers to that. But the topic is very interesting.