Actually the new translation is so close to the 1965 Mass when it is translated.
I was attending a workshop on the new translation and a friend had an old 1965 Missal with the English on one side and the Latin on the other. The English was practically identical to the new translations! What a pleasant surprise.
This translation is better than the old one, but it’s still the 1970 missal (although with some tweaks). The 1965 missal was basically just a translation of the low mass from the Old Rite, with a few changes to “tidy up” some loose ends left from earlier revisions.
It is very true that changes had been going on since Pius X. The major one that I recall is that in the 1950s, the Easter Vigil, which had disappeared centuries before, was reintroduced by Pius XII.