It is quite difficult in itself to fit in emotionally with someone because of all that they entail and then if you add all the social and religious requirements that you mention to us, then it simply turns the fact of getting married into a really challenging event, not only because the fact of leading a pleasant life with your partner, but also the social/cultural demands to be met.
I have been amazed that they allow someone to marry an inanimate object or a tree, for me, it is a representation of the very strict tradition they follow. Very interesting, that left me speechless.
Remember that these cultures don’t define Islam. They are simply taboos in some societies, not related to religion, but often the result of misusing religion as a tool for mind manipulation.
As for problems, some couples have to deal with disagreements among relatives, where they fight over who should marry their daughter or son. In the end, those who get through all the drama often end up living happily ever after. It seems that marriage is made difficult here.
I get the impression from what you say, that many times people marry for economic interest, the land or the amount of money that that family has, and of course to maintain that inheritance within the family and prevent external lineages from enjoying those benefits.
Or marry from the available limited options! :)