Why do we use "links" object to specify relationship locations instead of adapters

I do not understand why Ember Data uses the links object in a serialized payload to find out where the related model resources are located. Passing through the related model ids makes sense to me, but passing through the actual resource location seems like an anti-pattern. Isn’t this the responsibility of an adapter to specify the location of a resource? What’s even more frustrating, and was the source of some hair pulling for me, was that specifying the location of a related resource bypasses the adapter calls all together.