Because a certain subset of people (like myself) are basically happy with our lives and we want to keep living them more or less as they are, in the same way I'm happy with chicken pot pie and want to keep making it with chicken and crust and vegs. But if you were to tell me a dozen minor modifications I could make to my crust and my roux and my attitude and this metaphor is getting out of hand, but if there were little things I could do to make my pot pie BETTER, I would enthusiastically do them.
Ok that I will not do though.
So this is like that. FOR EXAMPLE. One of the first things Rubin discusses is her relationship to her possessions, and I LOVED IT IMMEDIATELY because she gave me permission to like my stuff. People are always down on materialism and like if you like things, you're a shallow person. We've moved an average of once a year since we were married 7 years ago, and every time we move I'm like, MAN I HATE MOVING, but I love my stuff. And Rubin talks about how the people vs possessions argument is a false dichotomy, how many of our Things are beloved because they remind us of our Relationships (bracelet from husband, picture from trip with sister) or because they facilitate Fun Times (pie plate to make pot pie for friends, board games to play after pot pie), and how the issue is more about how we select our possessions, what we keep around us and how we feel about it.
She talks about ways of identifying stress points in the house and making your environment WORK FOR YOU. And the whole thing is just so practical and sensible and you can put it to use and it's very enjoyable to read in the way that smooth, unadorned writing is. It's exactly the sort of life-improvement book I enjoy.