OC will naturally prefer to stick with other OC communities as a matter of preference and taste. But it is important to understand that the manner of worship is something that does change even in the Orthodox Church, but the faith is not subject to modernisms. Some people obviously confuse the manner of worship, beards and even the calendar as part of Church teachings whereas they have not been addressed by the seven Ecumenical Councils.
That being said, I am not opposed to changes as long as one can demonstrate that there is a need for them. Keeping up with the times and the Joneses is not sufficient reason to change. Show me that it is broken or wrong and we shall all change it. As far as I know, beards are biblical and the Old Calendar is still the only calendar used for the most important Christian event - Pascha - for all. All Orthodox Churches celebrate Easter on the same (Old Calendar) date, regardless of what calendar they use for fixed events. So, then, if the Calendar is not broken or insufficient, why change it?
The Gregorian Calendar was introduced by the Ecumenical Patriarch in the 1920s. He was a Freemason. Of all the changes he suggested (civilian attire for priests, clean shaven, etc.) the only change accepted by the partial Synod was the New Calendar. It was not needed, it is not theologically justified, and the most Orthodox of the Orthodox - Russia and Serbia - refuse it and justifiably so. Orthodoxy is not for those who like change for the sake of change. The unchanging character of our faith is reflected in the Churchs ability to be independent of fashion and trends, true yesterday, today and tomorrow.
I'm not arguing that. Perhaps you misunderstand. My only concern at this point is who is or is not in communion with Rome. I know the traditional Greek OC well enough considering they comprised most of my in-laws for 10 years.