Since our patriarch has no immediate jurisdiction over us, unlike our diocesan bishop, I can assure you that you are simply making a caricature of Orthodoxy which is incorrect, because you are applying an ecclesiology unique to your Church to ours (i.e., you equate patriarchs with popes). I can understand not wanting people to leave your Church, because you consider it to have the fullness of the truth, but that doesn’t mean that you therefore must tell untruths about the Orthodox Church in order to achieve that end.
It was not my intent to show a caricature or say untruths about the EOC.
I realize I made a mistake (at least as far as Russian Orthodox ecclesiology has been set up since a Russian Tsar invented the structure of a Holy Synod, which can elect and depose a Patriarch) by mentioning the Metropolitan of ROCOR and the Patriarch of Moscow as examples of ultimate authority within Eastern Orthodoxy - I should have mentioned their respective Holy Synods instead, as my new authorities who were going to replace the Pope in the case that I was going to convert to EO.
That being said, my warning remains the same: if you are a Catholic converting to Orthodoxy, you are rejecting the one legitimate Shepherd who was placed into that position by Jesus Christ - and that Shepherd is, of course, Peter and his successor the Pope. By converting, you are removing yourself from under the true Shepherd’s authority and protection, and you are placing yourself under the authority of some other self-appointed “Shepherd” who essentially usurped that power from the real Shepherd, who didn’t receive from God the charisms necessary to perform that job, and who will consequently lead you astray.
I’m not saying that EO clergy are trying to lead astray and harm the sheep on purpose, but yeah, that’s what they do in the ultimate analysis. They didn’t receive the charism of infallibility apart from Peter’s successor the Pope, they are blind leaders, and they are leading astray and harming those converts who made the unfortunate decision to abandon the leadership of the Pope and follow these EO leaders instead.
Whether the ultimate authority/leader/shepherd in a particular EO Church is the Metropolitan, the Patriarch, or their Holy Synods, my point remains: they have usurped the authority of Peter, and you as a convert are leaving your God-appointed Shepherd in order to place yourself under the yoke of a usurper.
That’s why I say, the answer to the OP’s question is a no-brainer. Removing yourself from the authority and protection of the legitimate Shepherd appointed by Jesus Christ is bad. Choosing to follow a false shepherd instead of the real one is bad. The best the OP can do for her friend, is pray for her to receive the grace and not commit this mistake of leaving the fold of Peter and his successor the Pope.
Here’s what Jesus Christ told to Peter (John 21: 15-17):
15
When they had finished breakfast, Jesus said to Simon Peter, “Simon, son of John, do you love me more than these?” He said to him, “Yes, Lord, you know that I love you.” He said to him, “
Feed my lambs.”
16
He then said to him a second time, “Simon, son of John, do you love me?” He said to him, “Yes, Lord, you know that I love you.” He said to him, “
Tend my sheep.”
17
He said to him the third time, “Simon, son of John, do you love me?” Peter was distressed that he had said to him a third time, “Do you love me?” and he said to him, “Lord, you know everything; you know that I love you.” (Jesus) said to him, “
Feed my sheep.”
Please show me where did Jesus Christ appoint anyone else to feed his lambs, tend his sheep, and feed his sheep. You won’t be able to. Whether it’s the EO priests, bishops, Metropolitans, Patriarchs, or their Holy Synods, none of them received this commission and this authority which Peter did. Ergo, they usurped the authority of Peter. And they are trying to lift a weight that’s simply too heavy for them to lift because, unlike Peter, they never received the gift to be able to lift it.
When an EO shepherd (and it doesn’t matter if it’s an EO priest, bishop, Metropolitan, Patriarch, or Holy Synod) is telling a Catholic convert to reject the Pope, and to reject such dogmas and doctrines as the purgatory, the filioque, papal infallibility, the Immaculate Conception of Mary, or her Assumption, that EO shepherd is usurping the role of the true Shepherd who is Peter’s successor the Pope, and that EO shepherd is leading the sheep astray.
This is why leaving Catholicism is not inconsequential, and the best the OP can do for her friend, is to pray that her friend remains in the safety of Peter’s fold, where she won’t be lead astray and harmed by false shepherds and blind leaders.