But here's the issue for the Roman Catholic and if they were to read the Bible for themselves.
Rome has only dogmatically defined less than 40 verses of the Bible...less than 40 in their claimed 2000 years of existence.
Even if a priest is there to help them the Roman Catholic cannot be assured what they are hearing from their priest is actually the correct interpretation of the Word.
Tell us all about the "assurance" that you have that your minister is giving you the "correct interpretation of the Word".
How do you know it's correct? Because you agree with it? Hardly an objective test. Hardly a test that matters to anyone except you and God.
Rome has only dogmatically defined less than 40 verses of the Bible
Ex cathedra teachings do not, generally speaking, "dogmatically define" verses of the Bible. (What would that even mean? How would you "dogmatically" exhaust all possible meanings? Why would you even want to do that? "Hey Scripture scholars, your job on this verse is done; nothing more need be said." ... why?)
They do dogmatically define specific teachings concerning faith and morals. So that, for example, when Arius taught that God-the-Son incarnate in Jesus was a "lesser god" who was created by the Father at a point in time ("there was a time when He was not" was their slogan), the Nicene council authoritatively, dogmatically, said, "NO" ... God the Son and God the Father are homousios ("of one substance") and God the Son was eternally "God from God, Light from Light, True God from True God".
And when Pelagius said that grace consisted of us being able to save ourselves by our own efforts and that the Cross was just Jesus giving us a good example, the Church authoritatively -- dogmatically -- stepped in, most notably at the II Council of Orange (a local council given dogmatic force by a later Papal decree) and said, "NO" ... apart from grace you are dead in your sins and can do nothing at all to gain God's favor.
I'm betting that you agree with both of those positions. Christians don't have to re-fight those fights because the Church, at a very early stage, ruled dogmatically on them. If my priest teaches contrary to those dogmatic positions, I know he's not teaching the faith.