If you never were Catholic and just go by the bible, mainly the gospels, it’s very understandable why they would attack tradition. Jesus had such harsh words for the Jews about their traditions that it leads you to believe all tradition is garbage. Just avoiding it all together looks like a good idea from a bible Christian POV.
Until, of course, you start digging into history and find out how much you are actually already relying on Catholic tradition. Which books are in the NT? Catholic tradition. Who wrote the gospel of “Mark” and how do we know since it doesn’t say so anywhere- Catholic Tradition? Christmas day? Catholic tradition.
They do seek like a verifiable library of tradition at times, and of course we cant provide that. Pretty much everything has already been defined dogmatically so not sure what the problem is, tbh.