>>8259
>Is the wide viewing field just for immersion or does it have any other design purpose?

Some equine details I ignore, such as the fact that in our world, equines are obligate nasal breathers, and they don't have a mechanism for vomiting.
But our equines also have the largest eyeball of any land mammal, IIRC, and those are placed on the side of the head ... exactly because they need to see behind them.
A video of just a square where they have depth perception, especially when what they're looking at is flat, isn't really reasonable to assume, I don't think.