One thing which Vatican II seems to have done is to recognize the importance of the subjective as well as the objective dimension of a soul’s disposition for salvation. It is possible to take the subjective dimension of human experience seriously without being a relativist, as the work of Bl John Paul II on the theology of the body clearly demonstrates. Of course, all the saints already said such things, St Thomas Aquinas for example, observes that for an act to be virtuous it must be both objectively so and perceived to be so by the person commiting the act.
The Council of Trent had focused on defining the objective dimension, as both Protestants and Catholics shared an implicit understanding that a soul needed to be well disposed in order to benefit from the grace of God, there was no need to state this. This had sometimes led some to focus on the objective dimension to the neglect of the subjective, believing that it was necessary to be Catholic before they could receive any grace at all, so to focus on making people Catholic first, before any attention could be paid to making them good. If we ignore the subjective disposition, it is better to be Mussolini than Albert Schweitzer - better to be an evil Catholic than a virtuous Protestant, as only the Catholic is in a position to receive the fullness of God’s grace - this is clearly an error.
One consequence of this is it made ecumenism impossible - approaching a problem such as opposing abortion or nuclear proliferation meant first of all converting people to Catholicism, and only then would they be able to bring about good ends. Instead, it is possible to unite with Protestants, Jews, and other people of good will to bring about such good ends, even while we work for their conversion.
I think in its consideration of the doctrine of the Church, Vatican II recognizes that the same subjective division passes through the visible Church and the world, the division between the disposition to follow God and the disposition to become our own gods, without in any way diminishing the Church’s understanding of itself as obejctively the fullness of the truth and the kingdom of God.
Of course, it is best to be a virtuously disposed Catholic, but there are people outside the visible Church who are making more progress by being virtuously disposed to the fragments of the truth they have, than people inside the Church who are ill disposed despite having the fullness of the Truth. There is a fine line between venerating the Church as instrument of God’s grace and worshipping the Church as if it were God, a fine line between doing God’s will and playing God, although only those who are both in the visible Church AND subjectively disposed to submit to her discernment, are able to know for sure whether they are in one group or the other.
I think the liturgical reforms also reflect this - a move away from an exclusive focus on the objective good of Christ’s becoming present to us in the Blessed Sacrament (Adoration) toward a focus on Christ’s intention of entering into a relationship with us through His presence (Communion) - ‘this is my body for you’.
So, both disposition (the universal vocation of the laity to sanctity) and proper ecumenism and communion, and this is my little take on how the three are related.