I just can’t see a difference between speaking “ex cathedral” and changing the catechism. The catechism is supposed to represent the immutable precepts of God. To change it on a whim, on the basis of changed social conditions shows a fundament misunderstanding or misrepresentation of what God’s Word truly is. I see this as a fundamental shift to a man based theology. Even Aquinas must be spinning in his grave.
Salvation, like many post Vatican II Catholics, do not know what they are talking about. All of Catholic doctrine matters, not just the “ex cathedra” ones.
I’ve never seen anything in the catechism allowing “Eucharistic ministers” - but the American Church pretends its carved in stone. The “extraordinary ministers” are for emergencies, and allowed on a case-by-case basis.