Go look up photos of what the SSJK do to the DL of St John (which is the extreme latinizationist end of UGCC & Old World Ruthenian praxis. Or what the worst of the Elko-ist clergy did in the New World… Removal of iconostasi, latin fiddleback vestments (sometimes including the maniple!), deletion of chant, placement of the lamb in the monstrance, statuary in front of icons (or in place of), elimination of the canonical hours for the faithful (replaced with the Dominican Rosary), suppression of the Akathists and Panachidas (again, replaced by the Dominican Rosary)…
And that’s not counting the licit alterations… elimination of some of the ektenia, redaction of verses in the surviving ones, the option to take them once or more than once in some uses. And the various ways the overlapping feasts combine movable with immovable for which propers are used, and whether to add the festal propers for the lesser coextant feasts. And then the options for vernacular and traditional language in diasporan eparchies (All traditional language, all modern form of traditional language, all local vernacular, all traditional with some items 2nd of 3+ repeats in the vernacular, all vernacular but with second repeats in traditional). Incensation Hymn or not. Post-Dismissal hymn or not. Hymn during Communion - Psalmody, Proper Communion Hymn(s), both, or a song, or a the proper hymn and a song, or a psalmody and a song, or all three (normally proper, psalmody, then song). Full prostrations or bow at the words of institution and at the epiclesis. Matins - None, as a separate service with a clear break, or as the introit to the DL; if used, 1 homily or two?