The provided ConfigurationBindingsValueProvider is too limited, due to missing extension points: It would be beneficial for project implementations to be able to influence the source of adaption for the config. See also the implementation of the getBindings() method: https://github.com/apache/sling-org-apache-sling-caconfig-impl/blob/master/src/main/java/org/apache/sling/caconfig/impl/ConfigurationBindingsValueProvider.java#L77.
This should not be tied to the current resource necessarily, but instead be tied to the current resource by default, but leave options open for overriding this behavior i.e. in CMSes where you might want to use another object to to act as the determinator of the context.
See also the discussion in: https://wcm-io.atlassian.net/browse/WCON-75