It seems to me that the Orthodox must leave everything up to individual bishops because they do not possess the unity to convene a Council.
A a strength of the Orthodox church is that all diocesan bishops are equal in power in their own dioceses, while being accountable to the Holy Synod of the church in which they are consecrated. The primate of that church (whether merely autonomous or fully autocephalous) as
primus inter pares presides over the Holy Synod.*
This is how Eastern Orthodox, Oriental Orthodox and Assyrian churches work, and it is also how the Roman church used to work up until the development of the strong papacy in the late first century in response to inappropriate interference by Charlemagne in the functioning of the Roman church, but this opened up a host of problems with your church such as the divergent phenomena of Scholastic Theology which caused your church to estrange itself from the East.
Also in the Orthodox Church, the laity can reject a council, denying it ecumenical status, as happened in the case of the Council of Florence, which they can’t do with the councils of the Roman church such as Tridentine or Vatican II. And this is a good
* Except in the Russian Orthodox Church when Czar Peter “the Great” uncaonically seized all church property and control of the church and reduced the Holy Synod to the three most important metropolitans, and made the effective head of the Russian Orthodox Church the Procurator, a layman appointed to the council and given control of the finances, and this caused a disastrous period of stagnation in much of the Russian church, but even here, the individual diocesan bishops still retained the bulk of their authority, and the Russian church compensated for the disruption through a series of dynamic individuals who maintained the spiritual vitality of the Church during that era, such as St. Herman of Alaska, St. Innocent of Alaska, St. Peter the Aleutian Martyr (who was martyred by the RCC missions St. Seraphim of Sarov, St. Ignatius Brianchaninov, St. Theophan the Recluse, St. John of Kronstadt, and St. Neltary of Optina, as well as Russian Athonite monks such as St. Silouan. They prepared the Russian church to endure the glorious maryrdoms of the 20th century in which Russians, Ukrainians, Belarussians, Latvians, Lithuanians, Estonians, Poles, Finns and other Orthodox people were killed by the Communists.