Greetings in that Divine and Most Precious Name of Our Lord and Savior Jesus Christ!
Armenians will give communion to Episcopalians, so I don't see them as a good measuring stick for acceptance of Orthodoxy.
Some EO priests will commune Copts, Ethiopians, etc, which I think is unfortunate and a betrayal of the real situation. The Eucharist is an expression of unity, not a means to it.
No disrespect, but its precisely these divisive attitudes that continue to bring schism in the One, Holy, Catholic, Apostolic Orthodox Church. Lets stop all this nonsense in the bud! Why argue over such things and divide those willing to unite and come together? We must start somewhere, and I for one am glad to see many leaders of our Churches coming together for dialogue year after year, and it is logical that our Churches will all reunite sooner than later, as we are all coming to realize that mostly, we have all been reaffirming the same things in different phraseology and history and culture, but these should not divide our Communion.
Also, I feel your interpretation of the Eucharist is a bit disingenuous, as the Eucharist is the Divine Flesh and Blood of God in actuality, not symbol, and as such it is not merely an expression of unity (which would be the case it it were purely symbolic) but rather IS THE MEANS and SOURCE towards unity. It is the United Person of Jesus Christ that united seemingly divided humanity, just as Christ even united the division between Herod and Pilate, and ONLY Jesus Christ in the literal sense, who in the operative and active power of God unites human beings who are inherently separate and fractured. We never unite ourselves by our good ideas or our ideals, by our sociocultural baggage or our kinship history, rather it is purely the love which only emanates from the Godhead which brings harmony, unity, closeness. Where human beings seek pride, self seeking ambition, and division, the Lord alone grants us Unity, Harmony, Oneness. So we must pray always in humility and sincerity that GOD bring us together, and not we ourselves!
Further, the Eucharist is the very source of this operative Power of God amongst us, so why should we be divided amongst those who uniformly confess the Real Presence and sing, "Amen Amen Amen, I believe and I confess that this is truly He"