In India, you don't ask elders "why?" for anything they tell you to do, that's considered disrespect - whether it is parents or teachers. That's why many customs that made sense once upon a time, have morphed into meaningless ones, because they continued by tradition rather than understanding.
At the time marriages were arranged by parents, this made sense because you get to preserve your culture, traditions, language etc.. (in a situation where dialect depends on the place and caste).
> Why not let the two people getting married make the decision if they want to merge the two cultures?
Well that's insane. Maybe, thinking from the place of those elders who are highly interested in conserving their culture, it doesn't make sense to leave everyone to their own causing a mix-mash of different cultures and interests, and that's the generation gap. Although it is more likely attributed to belief rather than such line of thinking.
At the time marriages were arranged by parents, this made sense because you get to preserve your culture, traditions, language etc.. (in a situation where dialect depends on the place and caste).
> Why not let the two people getting married make the decision if they want to merge the two cultures?
Well that's insane. Maybe, thinking from the place of those elders who are highly interested in conserving their culture, it doesn't make sense to leave everyone to their own causing a mix-mash of different cultures and interests, and that's the generation gap. Although it is more likely attributed to belief rather than such line of thinking.