Primarily, this is because science is a process of discovery, and human beings are finite. Scientists routinely discover facts that reveal new things about the world, things that previous generations did not know and, thus, could not take into account in formulating their interpretations of Scripture. Past interpreters were relatively free to let their imaginations run wild in interpreting Genesis 1-11. Next to nothing was known about pre-history. The only constraint was the Scripture itself. By contrast, a present-day interpreter must work within a tighter framework of factual constraints. This is a pattern repeated throughout history, and it is also why you are discussing the issue at BioLogos rather than a YEC website.
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