In my opinion, it's a powerful idea, a meditation, which cultivates a change of heart for those who are inclined. Try to imagine a monarch sending their first born as an emissary to a foreign nation to save you, little insignificant you, knowing they would be tortured and killed in the process, but the monarch sends them anyway out of their love for you. Imagine the first born knows this will happen and volunteers anyway; volunteers for the mission, the torture, and the death out of their love for you.
From the human perspective, the sacrifice is what happens in the heart of the monarch sending their first born knowing what will happen. From the human perspectve, the sacrifice is what happens in the heart of the first born knowing what will happen when they get there.
From the divine perspective, no one ever dies, nothing ever dies, so it's true there is no divine sacrifice. But that's not the point. The point is the divine is revealing itself in human terms as a monarch who is willing to suffer as any parent would, sending their first born to save the rest of their children. Virtually any parent can relate to ths idea. The point is the divine is revealing itself in human terms as a first born volunteering for torture and death to the save the rest of their siblings. Virtually any human being can relate to this. The point is the divine is revealing itself in human terms as a comforting spirit of truth which will not leave the remaining siblings/children stranded after these events occur.
The sacrifice is a revelation of the divine, it's the execution of a divine plan, it's the divine establishing a relationship with those who are willing and able.