We are in the same position Andrew: much is achieved by editing via Collector and viewing via web-maps. Editing via the web-map is an important functionality to have but I'm more thrown by the inability to symbolize based on related fields as it degrades the efficiency of Collector. I've always set my crews up with data where the feature changes color based on a 'Visit_complete' field that shows whether or not data has been collected for that feature. It lets them track not only their own work, but work of other crew whoa might be nearby in the field, simultaneously editing the data. Now that they can collect into a related table, we need to similarly indicate progress via that table.
Really hope ESRI can get on this functionality soon. Any workarounds known to anyone to allow this kind of symbology?