Most of the discussion has centered on the debate of if FeatureType is an AttributeType or not (specifically a ComplexAttribute).
Argument For FeatureType as a ComplexType: Feature represents content that can be navigated by xpath in exactly the same manner as a complex content. Whatever problems we run into with Feature we will also run into with complex content.
Argument for AttributeType refering to a FeatureType: Some of the concerns of AttributeType are not applicable to FeatureType (such as multiplicity for example).
Design Ideas (No Decision reached yet):