I totally agree. Just as God didn't give Adam a complete and perfect volume of doctrine when he got booted from the garden, and just as God has yet to provide a complete and perfect volume of doctrine to the world, it is apparent to me that just as we teach our children in accordance to their level of understanding and willingness to give heed to that which they already have been taught, that our Heavenly Father also works according to the collective understanding and obedience of his children at any given time. (i.e., From the time of Moses down until Christ, Israel was given a lower law adapted to their spiritual level and level of obedience.)
To me, this is one of the great messages of the Bible as we have it today. And as such, all the more reason to be diligent to the light and knowledge we possess and always be willing to accept more light and knowledge when the Holy Spirit guides us to it. Hence, I see no need to rush to assertions like "the Bible is all the scripture we need." Perhaps the amount of scripture available to Paul and Timothy in their time was indeed sufficient for them in the context of their light and understanding. Yet, we live in a very different time and in very different circumstances. Surely our Heavenly Father continues to provide light and knowledge in our time as well. Surely his children in this time are just as valuable to Him as His children in other times. Rather than asserting that we have all that we need, perhaps we would better off asserting that we should give heed to the light and knowledge that we have, look forward to and pray from more light and knowledge to come, and welcome it when the Holy Spirit guides us to it.
God bless you in your journey for increased light and knowledge :)