So are you just asking what the theme of the chapter is -- what point it is supposed to be making? My answer is based on that reading of the question.
I think there are a couple of points to this chapter. The first comes from the last line of the chapter -- not everything needs to be fixed. The author is saying that for some things, cosmetics and outward appearances are unimportant. It is important, he is implying, to identify which things in life are important, which things are worth spending time, money and emotion on. The cars weren't.
The second point, to me, is that you take the good with the bad. In every relationship, there are surely things about the other person that you like and things you don't. For the most part, though, you have to take both of them together. You don't get to choose and say "I love that part of you, but you need to get rid of this other part." Jai had to accept both sides of her husband.
To me, those are the main two points of the chapter. What do you think?