Engagement rings are falling out of favor, and I don’t know anyone that adheres to the 3 month salary prescription of jewelry sellers.
Rules around food and drink buying during courtship are also getting squishier, and I believe that is because they come with the same problems, some men expecting sex in exchange for them, or feeling resentful that they have to buy them at all.
What security does the bride have with a dowry? What power does she really have to leave, with no education and not being allowed to work? Do you honestly believe the family is saving the dowry as insurance?
The dowry is just income for families who don’t have sons, and the families view it as such.