Nothing but theology is important. The structure of the Roman Catholic church is a discipline. They could keep the Papacy for themselves if they want it, we reject their dogmatic claim.
That does not mean Orthodox and Protestants are in any kind of agreement on this, they are like two different issues.
We oppose ultramontanism, but not hierarchical clergy. Protestantism has experience under a Papacy and has rejected it based upon that experience. Orthodoxy has never had a Papacy and does not need or want one imposed from outside. We have our own hierachy and discipline, and we understand primacy in church governance.
Holy Orthodoxy opposes abortion in any and every form, whether chemically, by IUD or otherwise. It is always killing.
The only methods that have been approved for avoiding pregnacy for pastoral reasons are non-abortifactant. Where we diverge with Roman Catholicism is that Humanae Vitae has declared the intention to avoid pregnacy, even by non-abortifactant methods, is a sin. The one concession being NFP, which is also acceptable to Orthodox.
We are really not that far apart, from an Orthodox point of view. Orthodox practice is certainly not like the “anything goes” approach of many Protestant pastors.