The use of policies is designed to “abstract” the API you present to the world, from all the back-end APIs that might exist.
We typically find that users prefer to present a simpler view to the outside world, rather than exposing their internal structure. Consumers of your API product don’t necessarily need to know what the back-end structure is.
So you can wrap-up a bunch of different levels of access to different end-points and expose it as a product.
For that reason, you’ll need to adjust what is published in the portal manually.