The statement, "history shows," or "has shown," is immediately suspect. It is  on a par with, "everyone knows," end of discussion.
It is so convenient for Catholic dissidents to locate pre-conciliar Catholicism to the days of Constantine as though there was a paradigm shift during the reign of that Emperor. They can therefore claim that up until the mid-sixties the Church was entrapped in a captivity resembling that of Israel in Babylon, as Luther claimed in the 16th century.
The Council of Trent did put down "lines in the sand" for the simple reason that without those lines Christendom would have descended into a moral and liturgical morass, a doctrinal free for all: cujus princeps, ejus religio could have descended to, cujus episcopus aut etiam parrochus, ejus religio. We see what the result of that was in Protestantism, 40 thousand different denominations, none of which can agree with each other.
Finally, who decides whether the rules are man-made or of God, just you?