That line though is from rabi nachman.
Wiy: (to clarify, i dont think im disagreeing with you) I think it was you who said in a different thread that Torah teaches us how to have the best life possible. So using what (I think) you said, the purpose of the Torah is to make your life better. All the mitzvos help improve our lives but if a person is unhappy then working on kibbud av will just make them resentful. Working on appreciation will bring a person to more happiness which will automatically lead a person to fulfill the de’oraysahs more properly. In other words having proper middos helps a person to better fulfill the mitzvos.