Learn in order to do!!

Hello Rabbi
I don't understand why the rabbi objects to the statement that the purpose of study is so that we know what to do.
The simple answer is that the purpose of the Torah is for us to learn and know what to do, "and you will learn them and keep them to do them."
It is quite clear to me that the Rambam and the Rosh did not seek 7 simple truths in the Gemara nor did they attempt to seek validity underground, but rather strove to understand the truth according to their understanding. This is also evident from many of the sources of the Sages:
Rabbi Yishmael his son says: He who studies in order to teach, has enough in his hand to study.
And to teach, and he who learns in order to do, is sufficient in his power to learn and teach to keep
And do.

The Mishnah explains that the purpose of learning is to learn in order to
To do, a study that leads to the clarification of man's duties in his world.
And so it is said in the "Midrash David", which is attributed to
To Rabbi David the Governor, grandson of Maimonides:

And this level is the highest according to my name, that he may learn Torah, and that he may be the goal.
His request is that her laws be revealed to him, and that he may look into her secrets, so that he may walk in her ways.
And he will do the commandments.

And there are the clear words of the Maharal in his commentary.
A way of life on the Mishnah in Avot above:
And so he began to say, "He who learned in order to teach" or "He who learned in order to
Do this because they intend to do it for the sake of heaven , not because they learned to buy the
The knowledge that this is not a teaching that he does for the sake of heaven, for the glory of God, blessed be He, because
Every person wants to understand and know, because wisdom is desired by everyone.
And the truth is that this is an explicit verse in Joshua.
Joshua Chapter 1 Verse 8
(8) This book of the Torah shall not depart from you, but you shall meditate on it day and night . Be careful to do according to all that is written in it, for then you will make your way successful, and then you will have success:
Thank you very much Rabbi and good news in God's name.