ArcGIS Online (AGO) supports access and mapping OGC layers from the web for WFS, WMS and WMTS.
It would be nice if OGC layers could also be displayed in a Jupyter Notebook. Currently if you display an AGO webmap that contains OGC layers in a notebook they are not displayed. Or if you have an OGC layer in AGO and try add it to a mapview in a notebook you get an error.
It is understandable that there are limitations; but you would expect display of OGC layers in AGO map viewer should also work in the ArcGIS API for Python map viewer.