Marriage is the union of two families. Even if the proposal is successful without the consent of the parents, the two parties cannot get married and are forced to break up, causing more pain for both parties. Therefore, in China, most people first meet their parents before proposing.
In real life, love can be a matter for two people, but marriage is not. Marriage often means the union of two families, so it is very important for two people to seek parental consent before getting married. With the blessings of your parents, you can boldly propose, and once a girl agrees, she can consider getting married.
But if you propose to your parents before you even meet them, and they don't agree to your marriage, even if the proposal is successful, the two may still be forced to break up, causing even more pain for both parties.