Fun speculation: Maybe we started with no crossover (which gives avoidance behaviour, keeping the organism free-swimming). This still works for a while as the axial angle between eyes and muscle groups increases, so there's no real penalty for having a bit of a twist. As the twist increases, it starts acting a bit like a discriminator, where we avoid small things less than large things, which seems good if we want to eat small things. Past 90°, we start spiraling towards things instead of away from them, which admittedly makes us crash into large things more, but we can chase moving things. Hunting has evolved!

But there's a delightful span between seeing someone post something on HN unrelated to AI, Cryptocurrencies or startups selling VS-Code extensions and the moment when I satisfy myself something outlandish (like space starfish) hasn't happened. During that time, all things are plausible.

[Edit. Which is not to say I disparage or discourage posting cool things you've found on the net. That's kind of what many of us are here for.]