Suppose I accurately map the coastline, and every relevant part of the coastline is depicted in my map. But the map is not the same as the coastline itself.
If my coastline has some feature that blips in and out of existence in a predictable way, I can integrate that into my map. My map then has uncertainty in it. That uncertainty is an accurate reflection of the coastline itself - but there is still a distinction between the map and the coastline.
I don't disagree with your second sentence. But there is still a difference between our theory of quantum mechanics and the universe itself.
If my coastline has some feature that blips in and out of existence in a predictable way, I can integrate that into my map. My map then has uncertainty in it. That uncertainty is an accurate reflection of the coastline itself - but there is still a distinction between the map and the coastline.
I don't disagree with your second sentence. But there is still a difference between our theory of quantum mechanics and the universe itself.