I believe it has to do with humility.
Let’s look at a bit of history:
Numbers 12:And the Lord heard this. 3 Now the man Moses was very humble, more than anyone else on earth. 4 So at once the Lord said to Moses and Aaron and Miriam: Come out, you three, to the tent of meeting. And the three of them went. 5 Then the Lord came down in a column of cloud, and standing at the entrance of the tent, called, “Aaron and Miriam.” When both came forward, 6 the Lord said: Now listen to my words:
If there are prophets among you,
in visions I reveal myself to them,
in dreams I speak to them;
7 Not so with my servant Moses!
Throughout my house he is worthy of trust:[c]
8 face to face I speak to him,
plainly and not in riddles.
The likeness of the Lord he beholds.
So, God loved Moses more than anyone. And because of this, the people came to Moses, not to God, for advice:
Exodus 18:Appointment of Minor Judges. 13 The next day Moses sat in judgment for the people, while they stood around him from morning until evening. 14 When Moses’ father-in-law saw all that he was doing for the people, he asked, “What is this business that you are conducting for the people? Why do you sit alone while all the people have to stand about you from morning till evening?” 15 Moses answered his father-in-law, “The people come to me to consult God.
Note that God did the same thing with Job and his friends:
Job 42:7-9New American Bible (Revised Edition) (NABRE)
Job’s Restoration. 7 And after the Lord had spoken these words to Job, the Lord said to Eliphaz the Temanite, “My anger blazes against you and your two friends![a] You have not spoken rightly concerning me, as has my servant Job. 8 So now take seven bulls and seven rams, and go to my servant Job, and sacrifice a burnt offering for yourselves, and let my servant Job pray for you.[b] To him I will show favor, and not punish your folly, for you have not spoken rightly concerning me, as has my servant Job.” 9 Then Eliphaz the Temanite, and Bildad the Shuhite, and Zophar the Naamathite, went and did as the Lord had commanded them. The Lord showed favor to Job.
So, Scripture also says:
James 5:16Confession and Intercession. 16 Therefore, confess your sins to one another and pray for one another, that you may be healed. The fervent prayer of a righteous person is very powerful. 17 Elijah was a human being like us; yet he prayed earnestly that it might not rain, and for three years and six months it did not rain upon the land.
Therefore, in humility, we should recognize that people like Our Lady, St. Joseph and the Apostles, probably have more influence with God than we do. And we should avail ourselves of their favor.