Which is why I hope for a further Council of the Roman Church that could not only clarify (meaning, to the point where there is no conflict or scandal with Orthodox theology), as well as reevaluate much in Canon law over the past 10 centuries. Not sure whether it should be Vatican III, Trent II, or Lateran VI.
I'm not really concerned with canons that are historically anachronistic (ie, dealing with the Crusades, the Jewish people, the Tartars, the "Empire of Constantinople", etc.) I do have concerns as a Westerner who is also a member of the Eastern Orthodox churches. My expanded list of expectations for changes to Roman canon law for there to be a true reunion (not just with the East, but with all Westerners Orthodox and Catholic) :
First: revoke the anathema on St. Photius (and he should be added to the Western kalendar.)
Secondly, and again - the removal of the filioque from the Nicene-Constantinopolitan Creed, adoption of the original Greek text of the Athanasian Creed, and overturning those canons demanding subscription to the filioque and the Holy Spirit proceeding from two sources (canon 1 of Lateran IV, canon 1 of Lyons II, and similar canons of Florence, Basle, and Trent.) Adopt the canons of the Orthodox Fourth Ecumenical Council against those who alter the Creed.
Third: restoration of the Apostolic custom of married clergy as retained in the discipline and canons of the Eastern churches (not going into the errors of many Anglicans and Old Catholics who allow those already ordained to marry, or consecrate bishops who remain living with their wives.) Overturn canon 21 of Lateran II barring sons of priests from ordination, and canon 7 of the same against those attending liturgies celebrated by married clergy.
Fourth: purge canons of anti-Greek ethnocentrism (ie, canon 4 of Lateran IV), hopefully they would reciprocate. If much else that I suggest were changed, there would be no need for the Greeks to "cleanse altars" or "rebaptize".
Fifth: respect the dignity of all the Patriarchs - they have their own omophorion, and don't need a pallium from Rome (canon 5 Lateran IV). Reevaluate the Council of Siena's conciliarism. Overturn Papal Infallibility, and immediate universal jurisdiction over the whole Church (Trent.)
Sixth: overturn Vienna's suppression of the Knights Templar of Jerusalem.
Seventh: overturn Constance's condemnation of communion under both kinds for the laity, as well as restoring paedocommunion (condemned by Trent.) Restore confirmation by chrismation at baptism. Restore Holy Unction for sickness, and not just once at the Extreme end.
Eighth: restore leavened bread to Western use (admitted as valid matter at Florence, and has been traditional at least in the English speaking world.) Respect other local customs (Western as well as Eastern.) IE: overturn canon 50 of Lateran IV in the English-speaking world, where a canon reinforcing the custom there of following the Levitical rules as to degrees of relation for marriage as found in the various BCPs, Books of Discipline, etc. (as Pope St. Gregory had allowed exception for the Anglo-Saxons in that area with St. Augustine of Canterbury.)
Ninth: Reaffirm the use of the "vulgar tongue" in the Liturgy. Expand the Canon of Scripture to include those books still found in the Eastern canon (after Council of Jerusalem).
Tenth: anathematization of Calvinist ideas on Original Sin, Justification, Predestination, etc. while returning the Roman church to the norm still expressed by the Eastern churches. Beyond dogma of the Judgement, returning post-Thomistic purgatory and transubstation theories to theolougmena (contra Trent, but after Jerusalem). Ratify the Orthodox Fifth Council of Constantinople (much needed here in the West - I sincerely believe the Methodist/Pentecostal/Charismatic movements are reactions/yearnings towards what St. Gregory Palamas expressed.) Included in this is my statement about reclaiming Christian neo-Platonism from the attempted Thomistic hegemony.
I hope that might provide some talking points rather than just the typical debate. I would say that pretty much covers Western Orthodoxy as well (with two exceptions - I have other reasons for thinking the Templars should be cleared and reinstated - I'd like to see the Hospitallers 'de-ecumenicized' as well, and I do believe the Levitical laws have provided a sound basis for valid marriage in the West.) Of course - I'd likeother things as well: East and West on one Paschalion and reckoning, for instance.