Our primary obligation is to love the Lord, our God. Saving our soul did not even make it into the top 10 iirc.
The coach and horses smashed through the Church’s teaching on moral absolutes when “you shall not kill” became “you shall not murder.” The Church’s teaching on conscience is reaffirmed by AL, not undercut. I have no idea how you think this will affect sacramental theology, but I doubt it will have much effect.
I do agree that this may be the most serious controversy since the Reformation. The number of remarried people who were essentially “expelled” by the Church has been eroding the Church’s teaching authority. The obvious injustice of it has alienated many from any moral law, but especially from one proposed by an out of touch clergy that is riddled with pedophiles. How is a marriage worse than molesting children? What is the Church if it attacks people for trying to love ove another?