Knowledge of the remote sources of a doctrine is not the same as knowledge & understanding of doctrine itself. The history of the canon of the Mass shows this - there is a genetic development from the beginning until now, so knowledge of the Roman canon as it was in 1474 will not automatically show what the same canon was like in 600 or so. So with doctrines, Catholic & other.
If people don’t understand a doctrine, they have no business criticising it; so their comments can & should be discounted. Discussions of Reformed doctrine might get somewhere, if only Catholics had the elementary good sense to read Reformed accounts of Reformed teaching. Not to do so, is an excellent way to make oneself look foolish, & ignorant, & bigoted: & if ever there were a way not to conduct apologetics, it is that.

How can there be informed debate, where there is no use of information ?
Understanding is not the same as agreement - without it, misunderstanding, & ill-feeling, & all the evils that flow from these two, will poison generations to come, when they need do no such thing
Are we so afraid that our own faith will collapse, that we dare not read Calvin, Zanchius, the Westminster Confession of Faith, the Puritans, A.A. Hodge, & others, so as to find out what Reformed theologians say about what they believe

? If we don’t do our homework, we are absolutely guaranteed to misdescribe, misjudge, & misunderstand their doctrines. But how is this any different from Reformed mistakes about what the CC teaches ? If we wish to be treated honestly & fairly, we have to begin by showing those qualities ourselves - then others may treat us as we want them to treat us. The Fathers, are so much praised on these forums, did not ignore what heathens, Jews & others wrote: Aquinas’ work is studded with quotations of & references to non-Catholics. Why are modern Catholics so slow to follow his example ?