R. C. Who?
What about the 400 years of early Church - no bible!
What about the first 1400 years - only scarce, laboriously hand-copied volumes in Churches?
What about the illiterate?
How are they to read a bible cover to cover?
What if they cannot afford a bible?
EDIT: Having said that, we are in a different age.
Saint Jerome famously states that “Ignorance of scripture is ignorance of Christ.”
Thus, the scriptures all reflect on our Savior. But, the New Testament is primary, and that is what Catholics hear at each mass and what they focus on. However, the “New Testament” was instituted by Christ in the upper room. Those are the words He used to denote the Holy Eucharist. This can be seen in the older English language bibles:
Knox “Then he took a cup, and offered thanks, and gave it to them, saying, Drink, all of you, of this; for this is my blood, of the new testament, shed for many, to the remission of sins.”
“And taking the chalice, he gave thanks, and gave to them, saying: Drink ye all of this. For this is my blood of the new testament, which shall be shed for many unto remission of sins.”
King James Version
“And he took the cup, and gave thanks, and gave it to them, saying, Drink ye all of it; For this is my blood of the new testament, which is shed for many for the remission of sins.”
That “new Testament” - the Holy Eucharist, is the source and summit of the Catholic faith, above and beyond the scriptures.
All scripture (73 books) is inspired, therefore we are called to read, and we should love reading, as it is part of our love of - our relationship with - God.
p.s. Jesus never taught bible anything. He said, “He who hears you hears Me” Luke 7:16 As to R. C., if scripture is all that you have, it makes sense to be devoted solely to it, even though that is not biblical.