I understand you take issue with the authority of the Pope according to Roman Catholics, but I don't see how Dr. D’Ambrosio is creating impediments for the belief in the theology of the communication of idioms as it is applied to Mary.
Authority of councils, or the bishop of Rome or otherwise, the theology is actually extremely sound. Considering the alternatives would then lead us to assume that God did not “assume humanity,” and that our humanity cannot then be said to be sanctified by the divinity of God.
I don't like that outcome.
As an aside, given the argument that the Emperor convened the council, you wouldn't say that is an argument here nor there for Cesaro Papism either. So the argument as to “who convened the council” deciding its authority is a straw-man.
The difference is that Papal representatives were present, despite Nestorianism being a purely eastern heresy. I mean, why would there be representatives from Rome if there were no Nestorians in Italy?
Its really quite simple. As we have seen with what appears to be increasing frequency even here on FR, the expansion of ancient Christological and Trinitarian heresies among Protestant ecclesial groups is cause for great alarm. Ascribing the validity of any Trinitarian or Christological dogma to the fantasy of Papal approbation as opposed to the work of the Holy Spirit among the Council Fathers and the living out of the dogma among the Laos tou Theou, the People of God, all but assures the rejection of those dogmas by groups which often identify themselves by rejecting anything out of Rome. To say that the dogmas of the 7 Ecumenical Councils of the One Church are dogma because the bishop of Rome said so is ahistorical nonsense and positively destructive to the inculcation of the Faith among the heterodox.
" Authority of councils, or the bishop of Rome or otherwise, the theology is actually extremely sound. Considering the alternatives would then lead us to assume that God did not “assume humanity,” and that our humanity cannot then be said to be sanctified by the divinity of God.
I don't like that outcome."
I agree. However, I also have problems with another Latin dogma which makes the Theotokos something other than a human woman, a goddess of sorts. If the IC is not a Christological heresy, I don't know what is!
"The difference is that Papal representatives were present, despite Nestorianism being a purely eastern heresy. I mean, why would there be representatives from Rome if there were no Nestorians in Italy?"
You do understand what an Ecumenical Council is, don't you? Its a council of the whole Church. That's why Rome was there. Heresy in any part of the Church is a danger to the whole.