As I posted and linked prior the changes in fasting and abstinence were prior to Vatican II.
Not too much changed really other that after the council people thought they were excused from abstinence.
What changed was that one could switch out another penance and I’m not sure that law wasn’t already in place.
Catholics are still obliged to abstain from flesh meat on all Friday’s of the year except certain feast days such as Christmas.
We must offer up some form of a penitential act.
Vatican II was a pastoral council nothing was defined dogmatically.
Protestants were brought into the council and other people of other faith’s.
The idea was that it was going to make the Church more appealing to Protestants and other people of other faith’s.
It was after the council that a new liturgy was formed.
Personally I don’t understand why we as Catholics who profess to be the one true Church would take advice from a group of people considered to be herectics.
After the change in liturgy there was a disobedience in the Holland and other countries where people were receiving communion in the hand.
Pope Paul the sixth made a indult stating that countries where communion in the hand been a tradition could vote in secret on the matter and decide on whether or not that will continue in their country.
Communion in the hand was never a tradition America.
Bishop Bernandin who was in charge of the United States Conference of Bishops cast a vote and when the vote looked like it was going to tip he recruited already retired Bishops to vote.
Technically this was illegal and communion the hand should have never been a tradition in America and if you go to Rome today and other countries you will not see people receiving communion in the hand they will always be receiving kneeling and on the tongue.
People that hold to this tradition will tell you that it was rooted in the ancient church because the writings of Saint Cyril but this is actually false as it’s agreed upon by many historians to in fact be a forgery.
If you read the entire document St Cyril talks about smearing communion over your eyes and your lips which is clearly herectical.
The problem is they take this one line from this document which isn’t even written by the saint and try to argue their point which is basically a straw man argument.
Sometime before or after this there was another liturgical decision to move the tabernacle to the side of the church this was done because a lot of churches were historical and they had tours in these buildings so they decided to move the tabernacle so that people could pray in private and also to protect the Tabernacle from being stolen.
Honestly I think this was a really bad idea because most churches are not historical and it really doesn’t matter what room you have the Tabernacle in people have still stolen Tabernacles and consecrated host.
Also since then there has been a decline in the belief in the true presence and Eucharistic Adoration.