In America at least, there are very few if any "pure" Greek Catholic families. Almost all Greek Catholics here have a mixed background, so much so that when they grow up and move away they attend Roman Catholic parish because it is just not a big deal. One of our priests estimates that possibly 80% of those who are canonically Greek Catholic attend Roman parishes. So whether one is a mixed background "cradle" or a mixed-background "jumper" the opinions and attitudes are very much shared. In fact the "jumpers" are often more authentically Eastern because they made the choice to be Greek Catholic whereas many "cradles" simple go to the closest parish which is usually Roman.
Regarding the first part, another reason why cradle Greek Catholics are essentially 'superior Novus Ordo
'. Another reason they lose so many: they move away and go Roman Rite, on top of the attrition to the larger culture that the Orthodox have (when the third, etc. generation doesn't identify with the ethnic group anymore – I don't think manufacturing a whitebread American Orthodoxy/Greek Catholicism is the answer; I don't know the answer).
Regarding the second, I hear you, but...
The way many such jumpers want to be authentically traditional and Byzantine, exactly what Rome wants in that department, is admirable. But I agree with the poster above that they don't represent most Greek Catholics. Most Greek Catholics = 'authentic' Greek Catholicism, like it or not. And you don't want to make cradles resent the well-meaning newcomers.