When I've asked in the past, Esri people told me that PostGIS editing will not work. I always try things myself, regardless of what Esri people say. My answer is still NO, you cannot edit. I think the chances of them enabling editing are pretty much non-existent. They want everyone to subscribe to an annual license for ArcGIS Enterprise and supporting PostGIS would dilute that effort so this is no surprise to me.
I just installed ArcGIS Pro 2.8 this afternoon and tested it with a fresh install of PostGIS 3 / Postgresql 12 (running on Ubuntu Server installed from UbuntuGIS). I am using a "personal" license so it's the "Advanced" version of Pro and I have the interop extension too. To get some data into PostGIS I loaded a polygon shapefile into QGIS and then used drag and dropto copy it into PostGIS, AMAZING and stunning to me how easy that was. Then I closed it and I started Pro 2.8, and I was able to connect to the database and load in the PostGIS table as a feature class. It worked just fine. Then I tried to edit it and it said "This layer's workspace is readonly." I searched the properties for the layer and I searched Esri online help for that string and found nothing. I am connected with the same credentials in both QGIS and Pro so the problem is in Pro. Then I launched QGIS and edited a polygon there. I stumbled because I have not used it for editing but I managed to move a vertex. Then I refreshed the layer in Pro and the change immediately appeared. I don't have any way to test the Basic license of Pro. I disabled Interop to make sure it was not doing something behind the scenes to allow me to view PostGIS data, and that had no effect. With it turned off I restarted Pro and the PostGIS layer loaded. AFAIK interop is just a very complicated ETL filter tool and does not do anything directly in the Pro GUI. Hope this helps -- Brian
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