We would like to perform "advanced" editing operations including (but not limited to) Cut & Merge when editing polygons using the edit widgets in ArcGIS Online Map Viewer and 4.x Web Apps including Experience Builder.
It will be fantastic to bring this level of functionality to ArcGIS Online users. The only way to allow ArcGIS Online users to simply cut a polygon in half at the moment is with the Edit widget in ArcGIS Web AppBuilder, which we want to phase out.
Thanks Team!