That's right, they're holding the bowls full of incense which are the prayers of God's people. How does that qualify as intercession? They aren't petitioning God for anyone; the people's own prayers are ascending directly to God.
let me put up an analogy.
The guy can sing solo, why he needs a choir? It sounds better!
God is the King upon His throne,
yet His friends stand close beside Him.
When we pray, our voices rise —
but when the saints join in, our prayers become a choir.
We do not need them to reach the King,
but love makes us ask them to sing with us.
For the King delights to hear His friends pray as one.
You can always sing alone in your bathroom!
