Father Z’s view seems to be that the U.S. GIRM 160’s reference to a “norm” means that our bishops were just trying to explain what the custom is round these parts, as though it were nothing more than a helpful guide for foreigners. But the underlying GIRM passage on which our norms are based says, “Fideles communicant genuflexi vel stantes, prout Conferentia Episcoporum statuerit.”
Prout: According as, in proportion, accordingly, proportionately as, just as, as
Statuo: To establish, constitute; In gen., to establish by authority
The
editio typica GIRM 160 says that the faithful communicate kneeling or standing, “just as,” “according as,” the Bishops’ Conference shall have “established,” “constituted.” It doesn’t say “genuflexi vel stantes, sicut mos sit, si velint.”
It’s a mistake to write off “norm” as meaning “just what most people do, but you don’t have to be very concerned about it.” For one thing, the
editio typica GIRM gives the bishops authority to
statere whether people will kneel or stand; it does not contain an invitation just to opine on what’s customary. Why would anyone think that a bishops’ conference would need the
recognitio of the Holy See to issue a purely descriptive statement about what most people "norm"ally do? No, they need the approval to issue the
legal norms which they are canonically entitled to constitute. These are the kinds of “norms” – i.e. things you actually have to pay attention to – of which
Redemptionis Sacramentum 5 emphasizes, “The observance of the norms published by the authority of the Church requires conformity of thought and of word, of external action and of the application of the heart.”
Anyone who does not conform his (or her) thought, word, action, and heart to the norm in U.S. GIRM 160, publishes by authority of the Church and repeatedly affirmed to have the force of liturgical law, is pretty much just picking and choosing what they like out of
Redemptionis Sacramentum and tossing the rest.