Appreciating the "traditions of men" that Jesus condemned

In the infamous passages of Matthew 15:1-11 and Mark 7:1-22, Jesus condemns the Pharisees for teaching "traditions of men," which Protestants claim rules out "Catholic oral tradition". The Catholic response to this Protestant accusation is understandable, but also unfortunately surface level. When texts are misunderstood in the first place but never corrected, then what typically happens is that these texts turn into 'surface level apologetic' passages that never get studied at all. In this specific situation, Protestants would allege that the Pharisees randomly began taking on all sorts of random teachings and inventing a new religion, instead of simply following the Bible alone for their theology. Such a shallow reading of the text would warrant us to take a step back and see what was really being said here.  

Before looking at the verses itself, the first surface level rookie mistake Protestants make is to think that Jesus was teaching that any doctrine not written on paper is automatically not from God and cannot carry any authority. That Protestant claim is obviously wrong by the simple fact Jesus never wrote anything down and that Jesus taught 'orally' throughout His ministry. Many periods of Salvation History involved teaching being passed down orally, such as the command to circumcise given to Abraham and not written down for hundreds of years later until Moses. With that out of the way, we can now approach the passage with a different mindset.

Here is St Mark's account of the situation, which I trim down for brevity: