Hi Mike -
We have a product where clients may use it against ArcGIS Server endpoints, local data packages, or ArcGIS Online endpoints. This product has lots of features, some of which use Find and Identify. These features currently work against ArcGIS Server and Local data packages. For ArcGIS Online we'd either have to consider these Find and Identify features unsupported, or code a unique set of logic for ArcGIS Online. We'd like to avoid unique coding based on the different rest endpoint types.