Suppose you do have a family business where the heir has some of the skills to continue the business but not all of them. If the heir marries the right person this would be an ideal answer to problems of continuity and succession. Let's say also, unlike Akane Tendo, the heir thinks this is a good idea.
How would somebody go about finding a partner who can fill a role like that?
It is modern western culture which has lost its way, not the other way around. Sure sure "we marry for love", yet do we? Our relationships don't last, because our individualism is fleeting and changes over time.
Arranging our lives to suit the generational continuity is more pragmatic and leaves a lasting contribution to humanity.
I don't speak for everyone, and obviously the partners would have to get along, yet a relationship one works towards for values is one built upon a foundation more solid than "likes".