Of course not. Any serious Reformed Christian would tell you that they have benefited from commentaries, while recognizing that the commentaries are not the Scriptures. Fundamentally, the Scriptures do have an objective meaning, whether our subjective interpretations line up with it or not.
But in this instance, I don't think I have come across a fundamental Orthodox doctrine that cannot be justified in Scripture or logically derived from it. You can point to traditions about the lives of the Apostles beyond what is recorded in Scripture, but I don't think any of it has a core impact on fundamental doctrine.
Usually it comes down to things like 'Icons violate the 10 Commandments' but these debates were had and resolved in Ecumenical Councils. And the arguments did not just turn a blind eye to Scripture as though pious Christians did not give due attention and reverence to the Scriptures. The images on the Ark of the Covenant were taken into account, and it was decided that there was more nuance than was accounted for when one just quotes the commandment with no context whatsoever.
And it is undoubtedly true that people can take things, such as "Assuredly, I say to you, there are some standing here who shall not taste death till they see the Son of Man coming in His kingdom.” to mean that Christ was predicting an immanent Apocalypse, and that this verse proves Christianity false. It is not apparently obvious in itself how this should be interpreted.
Non-Trinitarians can also point to numerous Bible verses in support of their position.
One of the greatest evidences for the reliability of the New Testament is how weak the chain of custody on it was. It was so widespread that it would be easy to see if a church was manipulating the text to say what it wanted it to say. If you compare this to the Quran, you will see the contrast.
Okay but I am talking about pre-distribution. Lets say the Church of Rome wanted to assert its dominance. From the viewpoint that the Church was not beyond making fabrications for the sake of politics or whatnot, one might easily suppose that one Church, or sect or whatever might 'find' a letter from Saint Paul and start to distribute it with the aim of giving credence to their claims of authority. This did undoubtedly happen. But from the viewpoint that the Church was quick to err, and fabricate myths, does it not cast doubt on everything? I know you don't have a position on the aforementioned traditions about Lazarus, but lets say for the sake of argument that someone was arguing for their falsehood. It is essentially proposing that the Church is not beyond fabrication, and if the Church was not beyond such things, then how can one claim that it accurately preserved anything? I am not talking about manipulation of existing texts that were already widely distributed, but fabricating them and then distributing them. If the Church just makes stuff up for its own gain and internal power struggles then why not dismiss it entirely?
I don't deny that there were false texts, there is evidence of this. There is evidence of gnostics among others creating false Gospels to push their own agenda. However my ecclesiology is such that despite there being those who would push a false Gospel, the Church of Christ would be protected and ultimately prevail. Which is why I believe that the Scriptures have authority. But it's not clear to me how this can be argued if one were to propose a Church caught in power struggles, and willingly fabricating traditions and so forth. It seems weird to me to argue for a Church that does this, and at the same time authentically preserves the Scriptures intact and without error.