If we really believe that the snake we see lying on the ground is an illusion, we will not be afraid of it, so if we still feel even the slightest fear we are not yet fully convinced that it is just an illusion. Likewise with the world.
Why then are we not yet fully convinced that this world is an illusion? For the simple reason that we cannot be so long as we experience this body as ourself, because since we are real, if the body is ourself it must also be real, and since this body is part of this world-appearance, if this body is real so must be the world.
Therefore we cannot escape from the allure of this world (the need we feel to change it, our liking to enjoy its seeming pleasures, our concern about expected profits and losses, our desire for various relationships and so on) so long as we experience ourself as this body. And so long as we rise as this ego, we will always experience a body as ourself and the corresponding world as real, so the only way to escape from the allure of any world is to investigate and thereby eradicate this ego.
There is no other way, and no shortcut. We just have to follow this simple path that our beloved Bhagavan has so lovingly shown us.