"Not an unthinkable thought" is a remarkably low bar

For sure. My point is that the culture Genesis 3 came out of was one that had at least some inclination to accept the idea of talking snakes, which makes it more plausible that the talking snake in Genesis 3 was intended to be understood as, well, an actual talking snake (which is how, at face value, the story describes it) rather than a puppet of the Devil, or a metaphor for human curiosity, or whatever.