I take it you’ve not read Montfort.
In the ancient world, people didn't just pray to the gods/God, they sacrificed to them. Sacrifice was always seen as a greater act than prayer.
I know you don't share our sacrificial theology, but you can't judge us by your limited standards either. What we define as the highest form of prayer and the supreme sacrifice is never, ever, ever offered to Mary. Not even close. So there remains an infinite gulf between her and God at the very heart of Catholicism, which even Montfort's rapturous devotion cannot ever bridge.