You are clearly missing the point. It's not that every woman lacks motivation, it's that the trend for woman is to lack a particular motivation to do a certain

You are clearly missing the point. It's not that every woman lacks motivation, it's that the trend for woman is to lack a particular motivation to do a certain thing, which - the author points out - is exactly the same behaviour men exhibit. It just happens to be that this tendency, coupled with differing social behaviours and expectations, is what has produced the current situation.