I don’t quite understand how there can be legitimate differences in the liturgy of the Roman Rite in different places. Small national adaptations for things, yes, like specific feast days and things like that, but probably more than 99% of the new English Roman Missal is exactly the same everywhere. That’s exactly what Liturgiam authenticam was trying to kill, this “create a rite” attitude. Have you seen the “1998 Sacramentary” that was rejected by the Vatican? It is awful, truly awful. The Order of Mass has countless options, and I’m not even kidding. I have it right on my desktop. The “Introductory Rites” consist of: asperges (four options), or a penitential rite (twelve options), or a “litany of praise” (twenty-four options), or a Kyrie (six options), or a Gloria (three options), and you couldn’t combine options (as in, have a Penitential Act, the Kyrie and then the Gloria as it was for probably a thousand years previously). I am not joking. That is forty-nine options, just for the beginning part of mass. That is such a disastrous, radical departure from the structure of the Roman Rite that I can’t even begin put it into words. Thankfully, LA and the CDWDS killed that before it could ever lay its venomous touch on us.
That is what I mean. Sure, the future LOTH will likely be very slightly different even in the English translation as to accommodate for small differences like feast days and whatnot. That’s fine, and it’s always been like that even before VII. But the vast majority of it will be the same for all English speaking countries. LA does not allow for major wreckovations like I wrote about above.