Yes, excellent point. This is very true.
It may not all have something to do with the Mass
One would have to hear the whole talk by Fr. Barreiro, but I think he has a good point. When everything is up for grabs, why should one issue be exempt? If the Church can change the Mass, then why can't they change the teaching on contraception?
Discussions before these arrid translations would not have descended to whether or not Jews were saved. Public Prayers from those times included prayers for the conversion of Jews. If it was not necessary to convert them, the prayers would not have been prayed.
How we pray does indeed shape how we believe.
The questions you bring up are exactly what disconcert me. Not only that, but instead of thinking that one has a firm rock to stand on by being Catholic, I increasingly get the sense that it is a constantly shifting sand pile.