ALL does mean ALL. "
All Scripture is given by inspiration of God, and
is profitable for doctrine, for reproof, for correction, for instruction in righteousness, that the man of God may be complete, thoroughly equipped for every good work."
2 Timothy 3:16
As to your second point, those who wrote the 66 books of the bible were inspired by God. The OT books (scrolls) were referenced often indicating they were in circulation during Jesus' ministry. And those who were inspired to pen the NT writings were actual eyewitnesses of the events that took place before and after Jesus' death, burial and resurrection. I do agree however, that the inclusion of the apocrypha is a man-made tradition.
The books of the apocrypha were written in what is known as the Silent years; 400 years between Malachi and Matthew. (400 BC - 1 AD) The books do contain historical information. But during this period there were no prophets and no one who heard from God. As such, the books written did not contain inspiration from God. 1 Maccabees 4:46, 9:27, 14:41 reveal there were no prophets at that time to reveal what God's people should do.
Also, before 1546 the Roman Catholic bible did not include the apocrypha. In 1546 the apocrypha was included in their bible in response to the Protestant Reformation.
Excerpt: The Apocrypha had been treated with respect by the early Church and some were included in early versions of the Bible, they were not officially part of the biblical canon for many centuries. The Council of Trent formally declared them to be Scripture, solidifying their place within the Roman Catholic Bible.
Lastly, it is important to note that Jesus did not mention any of the books of the apocrypha as scripture:
"And beginning at Moses and all the Prophets, He expounded to them in all the Scriptures the things concerning Himself."
"Then He said to them, these are the words which I spoke to you while I was still with you, that all things must be fulfilled which were written in the Law of Moses and the Prophets and the Psalms concerning Me.” Luke 24:44