Ok, if I understand you correctly, we must have the perfect 66 books of the Bible even though we do not need for example half of them.
Just because of the principle that if they would have some error, we cannot rely also on the rest we actually need.
Well, I think that God always preserves what is needed for His people in a specific time. We dont have the perfect Bible because we do not need it. And on the other hand, we have everything we do need today (not talking only about Bible, but about everything).
We need every 66 books ALL OF EM. Would you buy half a Bible for half price? When God is speaking to you, do you block out half of what he says? If he gave us 66 books is bc we NEED all of that. This is the last generation what other era do you think happens after the church age? There are things we need to know based on the OT for example the story of Daniels for the end of times.
Psalm (12:6-7) - The words of the LORD are pure words: as silver tried in a furnace of earth, purified seven times. Thou shalt keep them, O LORD, thou shalt preserve them from this generation for ever.
GOD'S words will never pass away. Heaven and earth shall pass away: but MY words shall not pass away. (Jesus Christ, Son of God) (Mark 13:31)
Psalm 12:6-7New International Version (NIV)
6 And the words of the Lord are flawless,
like silver purified in a crucible,
like gold[a] refined seven times.
7 You, Lord, will keep the needy safe
and will protect us forever from the wicked,
Ya sure all bibles are not corrupted they all teach the same thing.