It would be great to use OGC compliant WFS services in ArcGIS Online for 3D Scenes and Dashboards. Currently, it appears to only be possible with the ESRI Feature Service.
We would like to make use of our existing Geoserver Architecture and get feature rich information into our AGOL maps and apps. Otherwise we would need to use a workaround and publish data twice, to Geoserver and to AGOL.