Vatican II mandated that liturgical development be 'organic'. I suggest a touchstone for what is, or isn't, organic.
A change might be organic if you could just paste a newly authorised liturgical text, perhaps for a newly canonised Saint, into your Missal or Breviary ... and still keep using it. Or if it mandated revised Rubricae Generales so as to purge the Calendar a bit, so that you could use the old Books as long as you kept your eye on the ORDO.
Change certainly is not organic if it means you have to dump, as now totally unusable, your old Books, and shovel money at publishers to buy the new ones.
But - if readers are impressed by this definition - we will need a footnote to cover situations in which the Tradition was so badly ruptured a generation or so ago that one needs to be a bit radical (like the new ICEL texts) in order to pump out the bilge, get the ship on to an even keel, and put new parts into the engine, so as to get her under way again.