When you say obsolete, I think of something that no longer matters and is no longer instructive and should be thrown out or forgotten. So I’m never going to say that any of God’s word is obsolete. Even when the tabernacle was replaced by the temple or the temple replaced by Jesus the final high priest, people can still learn about God by learning about the history of the tabernacle and the temple. The directions for building them no longer have the same function as they did for the original audience, and we no longer have the same perspective on the texts as people living in a time when the tabernacle and temple were relevant to daily worship, but their history is still instructive and still points us to important truths.
I think there is a parallel with the narratives of Creation, Fall, Flood, Babel, Job, Jonah, etc. At points in Christian history the perspective on these narratives and their role in worship have been different (i.e. they have been viewed at various points as literal history, whatever that entails.) With the coming of certain areas of scientific knowledge and expertise in ancient literary analysis, we now have different perspectives on the role the narratives should play in constructing our understanding of history. But that doesn’t make them obsolete or negate the fact that these narratives can communicate essential truths about God and humanity.
When Paul talks about the Law in Romans he talks about it like a babysitter that was taking care of the people until something new and better came along. (Gal 3:15-29) I know it’s not perfectly analogous, but maybe in some way, the literal interpretation of OT narratives played a similar role, protecting people’s hearts and understanding from competing ideas, and guiding them to important truths, until a point in history where new knowledge made a different perspective more helpful when it came to that same task of guiding people to important truths. That doesn’t make the OT narratives “lies” any more than Christ’s work made the Law sinful (Rom 7:7).