I understand, but let me tell you a concrete example. Gen 11 to 12:1 talk about Abraham. It leads one to believe that Abraham left Haran when his father Terah died. Acts 7:4 says "father" and seems to confirm that, but never says "Terah". I did a study on the passage of time. I firmly believed that the scriptures tell us everything we need to know to understand what date all the events that are important throughout the scriptures. It took two years to find the reason for the messed up biblical math that this one inference suggests. In fact, I read in the book of Jasher that when Isaac was weaned Terah came to Canaan to partake of the festivities. Well, that fixed my math problem, but it contradicted Acts 7:4 so I dismissed it. Still not sure what to do I waited on the Lord. That's when I decided to do a word study. I found nothing in Genesis so I moved on to Acts. BAM! I found it.
Father can mean ancestor. So I checked the math and found that Noah died, "his father"! NOW the math worked out AND the scriptures. But I still wanted to see if a "distant" father would still be called "father" in the Scriptures and I found God Himself use this when speaking to Jacob:
Genesis 28:13 (KJV) And, behold, the LORD stood above it, and said, I [am] the LORD God of
Abraham thy father, and the God of Isaac: the land whereon thou liest, to thee will I give it, and to thy seed;
Abraham was Jacob's grandfather. Between Noah and Abraham there are 10 generations. So instead of the scriptures saying that Abraham's great-great-great-great-great-great-great-great-great-great-father died, it just says "father". That's how/why I read these books. Not to confirm/deny scriptures, those are set in stone, but to issue another way of looking at an explanation. Since the Jews are fully aware of their lineage to the nth degree, and I not being Jewish, I would never have thought of it that way. The whole of scriptures is a middle-eastern thought process, which is action based - touch, see, feel, hear; whereas Greek is thinking and abstract. This is why a lot of people in the west have such a hard time with the scriptures.
Did I need the book of Jasher, no. Could I have found the answer without it, yes. Did it help me find the answer, yes, it gave me an idea, that I followed. It's not right or wrong, it is what it is
I hope this helped a bit more.