This is a bit off. Many of the sui juris churches that you list have the very same “hertiage” all being daughters of Muckachevo. Among them would Slovak, Hungarian, Ruthenian per se (Uzzhorod), some “Romanian” (Maramorosh and environs), and Krizevci (with Zemplin Rusyn immigrants). Division upon national lines followed the development of these lines through the 20th century. This development came after the bulk of the immigration of Greek Catholics from those eparchies. While there were American immigrants who identified as, for example, Rusyn, Hungarian, or Croatian among Greek Catholics that formed the Pittsburgh eparchy, the connection to the Eparchy was clear and deeply rooted in tradition, most notably prostopinije and common hymns. It was not a matter of simply being cared for since they did not have their own bishop; they did have their own bishop - in Pittsburgh.
I do not see what it off. The heritage includes the country lived in and the language used in the liturgy. But I agree with what you say about how the development occurred. The CCEO
innovated the term Church
sui iuris in 1990. Divided into fractions by heritage is how the CCEO defines those ritual Churches today, independent of how it was before. For example there was a time when one was an ascribed member of a Church by baptism using the ritual of that Church, rather than by the fathers Church, regardless of the ritual used (today).
For the Rusyns, having immigrated from several countries, with changing borders, had some requirements placed upon them by their governments, such as the Hungarian Greek-Catholic priests that were Carpathian. This lead to a split of the Ruthenian Church finally into several, for example a historic timeline marked with codes for todays ritual Church (U = Ukrainian, R = Ruthenian/Byzantine):
? Lemkowszczyzna (U)
? Kamyanets (U)
1087 Przemysl (U)
1677 Lviv (U) (later moved to Kiev)
1771 Mukacheve (R)
1777 Krizevci (Croatian)
1818 Eparchy of Presov (Slovak)
1885 Ivano-Frankivsk (U)
1892 Father Alexis Toth, begins a merge with the Orthodox that becomes (in 1970) the Orthodox Church in America (OCA) – Carpatho-Rusyn supressed
1912 Canadian Exarchate (U)
1912 Eparchy of Hajdudorog (Hungarian)
+
1924 Ukrainian Exarchate USA 1924 – Bishop Constantine Bohachevsky (U)
1924 Ruthenian Exarchate USA 1924 – Bishop Basil Takach (R)
1924 Apostolic Exarchate Miskolc (Hungarian)
1929 Father Orestes Chornock begins what becomes the (ACROD) American Carpatho-Russian Orthodox Greek Catholic Diocese (Constantinople)
+
1958 Metropolitan Archdiocese of Philadelphia from Exarchate (U)
1963 Eparchy of Pittsburgh from Exarchate (R)
1977 ritus bizantini - renamed from Pittsburgen(sis) Ruthenorum (R)
1990 CCEO (promulgated 1991)
1996 Apostolic Exarchate (from Presov) Czech Republic (R)
2001 Apostolic Exarchate of Macedonia created (mostly ethnic Albanians)
2003 Apostolic Exarchate Serbia and Montenegro (Croatian)
2008 Slovak Metropolitan Church (from Eparchy of Presov), with exarchate of Kosice becoming an Eparchy, and Eparchy of Brataslava (Slovak)