If you want to engage seriously with today's point, you would be well advised to reread what I wrote, just before Universae Ecclesiae came out (honest, nobody broke the embargo by sending me an early copy; nobody ever does; I just have to rely upon my telepathic understanding of the Holy Father's mind), on April 27, the third piece of my Ratzinger-and-liturgical -law series. I was concerned to distinguish between the gradual changes made over the centuries in the Missal of S Pius V, and the radical, ruptured, novelty of the Paul VI Missal.
UE para 4 makes my point with delightful succinctness. It records that the old Missal "prolabentibus saeculis incrementa novisse". That's (almost) exactly right. The old rite had additions made to it; new propers, new votives, new prefaces. Fathers: if somebody gave you a copy of the first printed Roman Missal of 1474, you'd have very little trouble using it ... just three or four handwritten changes needed in the Ordo Missae ... as long as you were prepared to glue new feasts and Prefaces in. Additions constituted overwhelmingly the evolutionary development of the rite. [The English crib inaccurately and most deplorably translates incrementa novisse as "was kept up to date".] Then UA goes on to contrast this with its description of the post-Conciliar Missal as novum.
And para 25 makes clear that the evolutionary development per incrementa of the EF will continue "quam primum".