Irrelevant. There were always plenty of angels to pray to in the OT (which Caths pray to), as well as occasions of need to do so if that was viable and allowed, but instead the closest thing is that of Davind asking the Lord, "Let their way be dark and slippery: and let the angel of the Lord persecute them." (Psalms 35:6)
Allow the possibility of God in His Mercy providing other channels for His Grace than the ones explicitly described during the Old Covenant...on the same principle as St. Paul's "I have become all things to all men , that I might by all means save some."
(And remember, that even the Law itself was our schoolmaster to bring us to Christ.)