The idea of ​​the commandment

In the introduction to his book "Medicine and Halacha and the Purposes of the Torah" (page 10), Rabbi Yitzchak Shilat, from his teacher and rabbi Rabbi Gedaliah Nadel zt"l, introduced a concept that he called "the idea of ​​the mitzvah." And he does not mean the meaning of the mitzvah. What is the difference between the idea of ​​the mitzvah and the meaning of the mitzvah? Every mitzvah expresses a certain idea that the Torah commands us to implement. Even if we do not know why God commanded in this way, we can identify the idea underlying the mitzvah. For example: the idea of ​​the mitzvah of the sukkah is that during the seven days of the holiday – the sukkah will serve as our home instead of the rest of the year. In the language of the Talmud: "The Torah said: 'Every seven days leave your permanent dwelling and live in a temporary dwelling.'" From this we deduce laws, such as: "decree a ceiling," "settle as you would in your usual dwelling," the sukkah should be a "permanent sukkah," and more.
The idea is not the reason for the commandment. It does not say why the Torah commanded us to sit in the Sukkah. In the case of the Sukkah, there is an explicit reason in the Torah: "So that your generations may know that I made the children of Israel to dwell in Sukkahs, etc."
 
I asked: Do you agree with his words? Did you find a contradiction in his words?