You're assuming God was wearing an engineer hat.
Dorothy Sayers had a very interesting piece on this based on her experience as a novelist. She pointed out that the characters had events in their lives which were never explicitly detailed in the novels, even if they were discussed by the characters during a novel.
The author, far from being misleading by doing so, was serving a higher artistic purpose, since the novels had fixed beginning and end, but the characters (were they real) would have had a LOT of their life completely outside of the bounds of the novel.
The characters' behaviour would have to be consistent with their lives and experiences outside of the novel, even if those items never "existed" within the fictional world bounded by the novel.
That’s kinda the point of “Rosencrantz and Guildenstern are Dead”, noting the absurdity thereof.
The 10,000 year claim is based on a highly debatable interpretation of a few lines of Scripture given to a goat herder.
The heavens declare a much bigger & older space than man’s limited interpretation of a text concludes. When great contortions of understanding reality are required to unify with an unsure interpretation of Scripture, it’s usually the interpretation that’s got it wrong.