I guess the main issue here is that people confuse “Ecumenical” with “infallible” or “orthodox”, which is simply not the case. Ecumenical has a very specific meaning, and it can’t realistically be applied to all 21 of the Councils in question. They may be correct, and they may teach Truths upheld by all Catholics, but that doesn’t make them Ecumenical.
Although this may be the view of the Melkite Catholic Church on what constitutes an ecumenical council, it pretty clearly isn’t the view of the Roman Catholic Church. In his opening address to the Second Vatican Council, Pope John the XXIII states:
Mother Church rejoices that, by the singular gift of Divine Providence, the longed-for day has finally dawned when – under the auspices of the virgin Mother of God, whose maternal dignity is commemorated on this feast – the Second Vatican Ecumenical Council is being solemnly opened here beside St. Peter’s tomb.
The Councils – both the twenty ecumenical ones and the numberless others, also important, of a provincial or regional character which have been held down through the years – all prove clearly the vigor of the Catholic Church and are recorded as shining lights in her annals.
In calling this vast assembly of bishops, the latest and humble successor to the Prince of the Apostles who is addressing you intended to assert once again the Magisterium (teaching authority), which is unfailing and perdures until the end of time, in order that this Magisterium, taking into account the errors, the requirements, and the opportunities of our time, might be presented in exceptional form to all men throughout the world.
ourladyswarriors.org/teach/v2open.htm
Many of the western councils after Nicaea II declare that they are ecumenical councils; specifically the Council of Trent, which declares numerous times within the actual conciliar documents that it is ecumenical. That being said, it is obvious to me that the Melkite Church means something different by the term “ecumenical.”
If by ecumenical we mean that a council was attended by representatives of the Eastern Churches, then the Melkite view is correct, with the councils of Florence and Vatican One falling somewhere in a grey area. I don’t think Roman Catholics should have a problem with this. It would only be a problem if the ECCs rejected the dogmatic conclusions of those councils. Even then, those that are formulated purely in the context of Latin theology may be inapplicable to the East. Not inapplicable in the sense that something absolutely true and binding about the Christian faith is expressed in those statements, but only in the sense that those same truths are expressed differently through another theological system.
I agree It isn’t necessary to push the panic button all the way in when one Catholic Church says twenty-one ecumenical councils and another says seven. Particularly when from everything I have seen our bishops through the presbyters are teaching what everyone in the Catholic communion holds to be true.