You’re drawing sweeping ecclesiological conclusions from a very local experience, and that’s where the argument breaks down. Hearing Byzantine clergy critique Vatican II or modernism doesn’t mean the Byzantine Catholic Churches reject the Council or its doctrinal framework. Those same clergy commemorate the Pope, accept Vatican II as a valid ecuмenical council, operate under post‑conciliar canon law - (CCEO), and remain fully within the magisterial structure of the modern papacy (I realize that this doesn't really matter to you, but it merits being said).
What you’re witnessing is internal critique, not doctrinal dissent. The East didn’t “reject” Vatican II — it received it in the only way the East ever receives anything: slowly, organically, and without rewriting its theology. That’s not resistance; that’s the Eastern mode of reception.
Communion doesn’t erase theological diversity, but it absolutely does imply doctrinal alignment. If communion didn’t require doctrinal unity, then Arian, Iconoclast, and Monothelite bishops would have remained legitimate simply because they were inside the juridical structure. They didn’t. They were condemned precisely because communion without doctrinal alignment is counterfeit. The Byzantine Catholic Churches remain in communion with Rome because they accept the same dogmatic definitions, the same ecuмenical councils, and the same papal authority — even if they express these realities in a different idiom.
Ultimately, you’re comparing the East’s healthiest expressions to the West’s sickest ones. Vibrant Byzantine parishes, coherent catechesis, and ascetical spirituality are real — but they don’t represent the entire East any more than clown Masses represent the entire West.
Question about the CCEO: Does it allow for Communion to be given to non-Catholics like the 1983 Code does?
I believe this is it here:
Canon 671 - §1. Catholic ministers licitly administer the sacraments only to Catholic Christian faithful, who, likewise, licitly receive the sacraments only from Catholic ministers. §2. If necessity requires it or genuine spiritual advantage suggests it and provided that the danger of error or indifferentism is avoided, it is permitted for Catholic Christian faithful, for whom it is physically or morally impossible to approach a Catholic minister, to receive the sacraments of penance, the Eucharist and anointing of the sick from non-Catholic ministers, in whose Churches these sacraments are valid. §3. Likewise Catholic ministers licitly administer the sacraments of penance, the Eucharist and anointing of the sick to Christian faithful of Eastern Churches, who do not have full communion with the Catholic Church, if they ask for them on their own and are properly disposed. This holds also for the Christian faithful of other Churches, who according to the judgment of the Apostolic See, are in the same condition as the Eastern Churches as far as the sacraments are concerned. §4. If there is a danger of death or another matter of serious necessity in the judgment of the eparchial bishop, the synod of bishops of the patriarchal Church or the council of hierarchs, Catholic ministers licitly administer the same sacraments also to other Christians not having full communion with the Catholic Church, who cannot approach the ministers of their own ecclesial communities and who request them on their own, provided they manifest a faith consonant with that of the Catholic Church concerning these sacraments and are rightly disposed. §5. For the cases in §§2, 3 and 4, norms of particular law are to be enacted only after consultation with at least the local competent authority of the non-Catholic Church or ecclesial community concerned.