I really liked when you said that there are many secondary I think we are talking about reliable sources which are simply Wrong Well The point is very clear if you will read the Qur an yourself you will only see what you want to see An expert knows that there are other verses as well which gives women equal share in inheritence although it explicitly depends on your relationship e g a daughter gets half the amount as son but parents get the same amount and also in kalalah relationship there is no difference in gender at all Hence you have already seen that what kind of problems we can have if it will be allowed to use Quranic verses directly Cheers Talk