The benefits of wearing a veil is actually one way to become a good muslimah by closing their aurat. Some opinion scholars say it is not mandatory to use a veil, but if using it women will get a reward. But there are some other scholars who argue obligatory for women to be veiled.
Indeed there are many pros and cons about this. Actually veiled it has existed since the time of the Prophet, women-women Shalehah at the time of the Prophet wearing a veil. There are several letters in the Qur'an that provide explanations about covering the nakbab and wearing a veil or veil for women. One of them is QS. An-nuur: 31 which explains God's command to every woman to cover her private parts.