1LB, the two Vatican councils were composed of fallible men.  Is it your contention that the councils are somehow ‘infallible’, and that every one of their outputs is perfect and completely free from error?
V2 re-affirmed the infallibility of the pope, which remains the single biggest stumbling block to oecumenical unity, and attempted to pull the mantle of infallibility onto the bishops as well.  As I noted previously, it demanded ‘prompt obedience’ (which you might call infantilism) from the laity.  There is little to disagree with in G&S; it’s a bland document (war is bad!) more noticeable for what it DOESN’T say:  no mention of communism, western secularism, or the sleeping giant of Islam (which now of course has re-awakened).
Of course, when most Catholics think of V2 they think of the liturgy.  Here V2 made some modest proposals which in light of experience were mistakes.   I don’t want to blame the Montini rite on SacrCon because we all know that liturgy took liberties ...