I think they wanted to used a mixed race couple to show that no matter what race are you , you can also be together . There are no definition or any kinds of conditions to be with someone you love . And this is to show that there's racial harmony in it .
The bad traits that her husband has , actually is kind of good traits somewhat . As most people may think that all these character traits are bad , but to her is actually a sign to show that her husband is actually feeling fine , healthy or even " alive " . As her husband is sick at that time , these signs is actually sending out those message .
This is sort of a good way and quite creative . It can definitely promote the family values .