As a previously 27-year evangelical, I had never heard of the ECF before attending RCIA out of curiosity. I would wager even most Catholics have never read them. They’re not exactly easy to read. You must realize - if you’ve lingered here long enough - there are a handful of well-read Catholics (priests, lay-religious, history buffs) but the vast majority of questions are from every-day Catholics asking about Catholic doctrine/history, prayer requests…etc.
That’s not to dismiss Catholics as not understanding their history. They embrace the Church and its Tradition with much faith. It’s a beautiful thing that the Church has provided an environment where faith can flourish to such an extent that the ugly theological debates and questions are mulled over by the more intellectual and spiritual of our Church.
On the flip side I know plenty of “Bible Christians” that have never read the Bible all the way through.
And as an aside, most Protestants I know are not anti-Catholic. They’re just “not” Catholic. My great friend and Wycliffe missionary attended a men’s spiritual group with me Tuesday night at my parish, and had I not mentioned ahead of time that he was not Catholic nobody would have ever known. We had such a great time pondering the open discussion of religion in the public forum.