Speculation here, but that might be because they have all of the Apostles, and the Roman Church doesn’t. And they have all but one biblical city, and the Roman Church has only one city. With that context, one ought not be surprised at their indifference. It’s the Roman Church, in that context, that ought to be clamoring for reunification.
To see what I’m saying, pull out a map of Paul’s journeys in the Book of Acts. It’s the Eastern Church. Look at the titles of the epistles: Galatians, Ephesians, Philippians, and all the rest are Eastern cities, with the lone exception of Romans. Look at the seven churches in Revelation. They’re all Eastern cities. Look where Timothy and Titus were. Look at the cities to which Peter addresses his epistles. The New Testament is the Eastern Orthodox Church, man.
Then pull out the Encyclopedia of the Catholic Church, and look up the apostles one by one. They went all over the Eastern Church: Lebanon, Syria, Iran, Iraq, Turkey, Macedonia, India, Ethiopia, Libya, Egypt, blah blah blah – the only exception is Rome. The Eastern world is COVERED in churches started by and pastored by one or more apostle. The Eastern Church has every single apostle mentioned in the Bible. In unbelievable contrast, the Western Church just has one city, one church, started by and pastored by an apostle: Rome. Paul and Peter.
Sure, if you want the legend that James went to Spain I’ll give you a third apostle. Fine. That doesn’t change the larger point because James also traveled in the East, and the Eastern world is still covered, blanketed even, by churches started by every single apostle. And the West isn’t.
So, maybe that explains the Orthodox attitude that you’ve witnessed. I’m just talking out loud here. .