I think you're misunderstaning.
The Orthodox phrase it as a capitulation but not as one that the church innovated; THEY THINK CHRIST OFFERED A CAPITULATION IN MAT. 18:18.
No divorces can take place in the Orthodox church unless they fall into porneia; the only difference is the Orthodox feel that even then it is as a capitualtion NOT that marriage didn't exist.
The reason behind this is the Orthodox do not feel the wedding CREATES the marriage. The Orthodox bless an existing marriage.
There is a difference in reasoning, but the effect and the rules for remarriage are the same.
Here's one aspect I don't understand, and maybe you can help me: does the Orthodox Church also have (distinct from divorce) such a thing as annulment?
In other words, if something was truly defective about the attempted marriage from the very beginning --- say, they just went through with the wedding to affect the groom's immigration status, with the intention of divorcing thereafter; or they lied to the priest about their age and were in fact underage and personally immature as well; or the wife had no intention of ever having children, but secretly took morning-after pills, deceiving her husband --- is it also possible to get an annulment in the Orthodx Church? Meaning, an investigation and a declaration of nullity, ruling that this was never a truly a sacramental marriage?