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A simpler explanation is that we are not perfect and illusion is a product of imperfect perceptions. Having said that, illusion is also used by animals and the military for camouflage. The mistake is believing that we can be perfect, or perhaps, humiliated that we are not.
If we perceived absolute detail, that is every shade presented itself with acuity, the world would be a stranger reality yet, and possibly a jumble, less coherent than our present perceptions create.
The moth could not hide itself from the bird. The tiger would starve, robbed of its cover. Good would not prevail against evil. There would be no place to hide when the need arose.
There are distinct advantages of illusion that permit survival. We do not see things clearly, as through ground glass and that is just as well in some cases. However, our senses can be trained to spot the difference.
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