Let's be honest here.  Based on your posts to this forum over the past couple of years, you don't think that ANYTHING is good which resulted from Vat II.  I, and most of the Church, disagree with that position.  Dioceses were allowed a short period of experimentation to figure out what may or may not work liturgically in local settings, but then "rules" were determined and imposed by clerics in charge and the changes settled into the GIRM, which most parishes follow reasonably faithfully.  So yes, "reasoned modification" is a term I'd use.  The universe operates on constant change -- a truth which is both foolish and dangerous to ignore.  Peace.