The world is an illusion, is not a state of enlightenment unless it is reasonably supported. This is a critical description of the reality, that is in the form of an opinion or a belief. And if this has become a normal way of perceiving the world without a solid reason to support then it is a distraction. The enlightenment is knowing the reality behind the shadow. A belief thus held but not supported by the reason of something better in the view at its best is a purely philosophical quest.
It is never worth doubting the reality of the world, but it is always worth seeking enlightenment, seeking to know better, and becoming better aware. It is never worth destroying the constructs of nature, but without some destruction, nothing could be built. It is not good to fell trees but if no one had done so there would be no cities and towns.
The correct approach is in the appreciation, respect and acceptance of the world as we find it. We put our faith and trust in the world, seek to make it a better place. Until one day, you see something better, find a better way to understand the world. It is not that now you see the less of the world, but instead, you see more. It is like before you could see only the shadow, but now, you see the real thing causing the shadow.
The sceptics are led by doubt, as are most of the philosophers. But the enlightened never got there though doubting, but through faithful searching for the truth. If enlightenment is the objective then, the path leading up to it is a path of trust and faith every step of the way. In the mind of the enlightened, the world is never an illusion, even when seen with some greater reality in the perspective. On the contrary, it is especially then that the true significance of the world becomes manifest.