How wedding evolved?

Many tens of thousand years ago, people were hunting and gathering resources. As resources deplete, people have to move on. When two factions meet, I would imagine they clashed. The fittest will survive, and the egoistic males of loosing faction will be killed. The submissive females will survive and be assimilated. I assumed this was the family life of out ancestors.

I can imagine how difficult is it for all the nomadic tribes to assimilate to form cities. Somewhere down the road, hunter gatherers started to explore ways of growing their own food. I assume these will be simple to grow plants like bean sprouts. They still move on, but carrying seeds with them to another spot. When agriculture became more advance and substainable, they learnt that farming is more productive than hunting. However, everyone is settling at the same spot, near rivers! Tribes fought and at some point they learnt to live together. But the instinct caring for in-group probably persisted, leading to rules and laws being passed to prevent groups from clashing. In any labor intensive work such as agriculture, it must be a great lost if one of your member is married into another group. Therefore, some form of compensation was formulated to trade off the imbalance, and that is the ping4 jing4 (or proposing money). The married woman probably felt a lot of pain to move into another unfamiliar family, many probably ran off at some point, leading to more conflicts. Thus evolved the custom of beating the wife on her first day so that she would submit. On the other side, her family would miss her, thus evolved the tradition to returning to niang2 jia1 (woman's home) after a while. In between, there were traditions of exchanges of gifts to establish goodwill.

There are many others but I would like to stop blabbing, the point is ... I am feeling all these traditions are out of touch. Its so tiring to do things for the sake of it, especially you won't know what to do by reasonableness, except to ask. Our life and priority changes, and many customs were out of date. We need to evolve new customs to fit the modern world. Its time to change...