For you the argument about procession is is trivial. For you the acceptance of the Western understanding of original sin (and the Immaculate Conception) is trivial.
Most importantly, Vatican I and Vatican II doubled down on the RCC understanding of the role and authority of the pope. The Vatican did not, and does not consider this a trivial set of doctrines. Do you disagree?
Those doctrinal disputes didn't exist before the political divide developed.
Some quotes from earlier Eastern Patriarchs that make this point explicitly:
St. Sophronius, Patriarch of Jerusalem (c. 638)
Teaching us all orthodoxy and destroying all heresy and driving it away from the God-protected halls of our holy Catholic Church. And together with these inspired syllables and characters, I accept all his (the pope's) letters and teachings as proceeding from the mouth of Peter the Coryphaeus, and I kiss them and salute them and embrace them with all my soul ... I recognize the latter as definitions of Peter and the former as those of Mark, and besides, all the heaven-taught teachings of all the chosen mystagogues of our Catholic Church. (Sophronius, Mansi, xi. 461)
John Cassian, Monk (c. 430)
That great man, the disciple of disciples, that master among masters, who wielding the government of the Roman Church possessed the principle authority in faith and in priesthood. Tell us, therefore, we beg of you, Peter, prince of Apostles, tell us how the Churches must believe in God (Cassian, Contra Nestorium, III, 12, CSEL, vol. 17, p. 276).
Macedonius, Patriarch of Constantinople (466-516)
Macedonius declared, when desired by the Emperor Anastasius to condemn the Council of Chalcedon, that 'such a step without an Ecumenical Synod presided over by the Pope of Rome is impossible.' (Macedonius, Patr. Graec. 108: 360a (Theophan. Chronogr. pp. 234-346 seq.)
St. Nicephorus, Patriarch of Constantinople (758-828)
Without whom (the Romans presiding in the seventh Council) a doctrine brought forward in the Church could not, even though confirmed by canonical decrees and by ecclesiastical usuage, ever obtain full approval or currency. For it is they (the Popes of Rome) who have had assigned to them the rule in sacred things, and who have received into their hands the dignity of headship among the Apostles. (Nicephorus, Niceph. Cpl. pro. s. imag. c 25 [Mai N. Bibl. pp. ii. 30]).
St. Theodore the Studite of Constantinople (759-826)
Writing to Pope Leo III:
Since to great Peter Christ our Lord gave the office of Chief Shepherd after entrusting him with the keys of the Kingdom of Heaven, to Peter or his successor must of necessity every novelty in the Catholic Church be referred. [Therefore], save us, oh most divine Head of Heads, Chief Shepherd of the Church of Heaven. (Theodore, Bk. I. Ep. 23)
Theodoret, Bishop of Cyrus in Syria (450)
A native of Antioch, Theodoret ruled under the Antiochean Patriarch.
I therefore beseech your holiness to persuade the most holy and blessed bishop (Pope Leo) to use his Apostolic power, and to order me to hasten to your Council. For that most holy throne (Rome) has the sovereignty over the churches throughout the universe on many grounds. (Theodoret, Tom. iv. Epist. cxvi. Renato, p. 1197).
If Paul, the herald of the truth, the trumpet of the Holy Spirit, hastened to the great Peter, to convey from him the solution to those in Antioch, who were at issue about living under the law, how much more do we, poor and humble, run to the Apostolic Throne (Rome) to receive from you (Pope Leo) healing for wounds of the the Churches. For it pertains to you to have primacy in all things; for your throne is adorned with many prerogatives. (Theodoret Ibid, Epistle Leoni)
Sergius, Metropolitain of Cyprus (649)
Writing to Pope Theodore:
O Holy Head, Christ our God hath destined thy Apostolic See to be an immovable foundation and a pillar of the Faith. For thou art, as the Divine Word truly saith, Peter, and on thee as a foundation-stone have the pillars of the Church been fixed. (Sergius Ep. ad Theod. lecta in Sess. ii. Concil. Lat. anno 649)