You are 100% correct in asserting the importance of the Eucharist. However, I find your explanation of the basis of its importance weak - unsatisfying - absent.
Why is the Eucharist important?
A Mass is not the celebration of the presence of the Son of God. Indeed, he is present at Mass. However, If you are only seeing his presence at Mass, you are missing the point. Much more is going on at Mass than his mere presence.
The Mass is a victory party. It is a celebration of his victory.
What would a victory party be without the guest of honor - the hero of the victory? Of course, Jesus is present at his victory party. He wouldn't miss it for the world!
Furthermore, the Mass is not a retelling of what happened on the road from the Crucifixion to the Resurrection. It is a re-enactment. It is a reliving of the victory of Jesus Christ.
What exactly was his victory?
We took from Jesus his flesh and blood even though his flesh and blood did not belong to us. He forgave us even though we did not deserve forgiveness.
At Mass, Jesus transubstantiates the rabble and its ringleader - the priest and the congregation - from murderers into dinner companions when he forgives us for the evil that we did to him - when he transforms his flesh and blood into our food and drink. Food and drink are necessary for our survival. Without food and drink, we die of hunger and thirst. Without the God who loves us so much that he forgave us even for the evil that we did to him, death is just as certain.
On the road from the Crucifixion to the Resurrection, we tried to drain his most Sacred Heart of his love for us. We failed. Oh blessed failure! We tortured and killed him. We made him suffer and die. Yet, he clung to his love for us, held tight and refused to let go despite the evil that we did to him. His love for us is mysteriously intransigent, inexplicably persistent and radically stubborn (Lamentations 3:22-23) (Jeremiah 31:3) (Psalm 8:4-8). The dial that controls his love for us is in his hands not ours. Moreover, it is set to the highest degree and locked in place (Jeremiah 31:3). Not even the evil that we did to him could budge it (Lamentations 3:22).
Forgiveness despite the evil that we did to him is the vehicle that Jesus chose to reveal God to us. The odd couple of epiphany, our evil and his forgiveness, whose marriage was consummated on the road from the Crucifixion to the Resurrection, gives us a high fidelity representation of the reality of God. The wise rest their understanding of God on the byproduct of the violent collision between Jesus and the evil that we did to him on the road from the Crucifixion to the Resurrection. Its byproduct was forgiveness. Forgiveness is the sweet syrup that poured through the floodgates of his bloody wounds to dilute the toxicity of the Valley of Tears as sugar cubes dilute the bitterness of a cup of bad coffee. Our evil opened the floodgates of forgiveness.
Reverential silence at Mass? Pshaw! A victory party is a raucous celebration - a celebration of joy and happiness (Luke 19:37-41). Sing, dance, eat and drink! Do not be silent. Do not be still (2 Samuel 6:14) (Psalm 100) . Celebrate! He won! And we are the undeserving, unworthy, sinful beneficiaries of his victory!
The most Holy Eucharist is the throne of the Son of God upon the earth. It is not empty. He sits upon it