In-N-Out's niche is based on having a tiny inventory that does not necessitate a wide variety of kitchen equipment like freezers or heat lamps. If it doesn't make economic sense for them to have bacon as an option for $1 extra or whatever, I don't see how a veggie burger that they have to make on site with fresh ingredients would be remotely feasible.
Until then, vegetarians can probably make do with a grilled cheese animal style.
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