Hi Eric,
It it not currently possible to display existing features on the geopoint location map in Survey123 Connect or Web Designer, and hence they can not be displayed in the Feild App or Web App when uses views the geopoint location map. We have an open enhancement for this request already, which will allow displaying web maps with existing data and other types of tile and map packages, which would support displaying existing features in the geopoint map.
As for the map and your location being automatically displayed on the map, yes this is supported, and provided you have accepted that the web app (in a browser) or the field app (device settings) as access to allow location services, your location will be automatically obtained, and the default basemap will be loaded. Note for the field app you need to be online, or use an offline basemap pre-loaded on the device.
Currently using the Inbox map view, you can see other existing features that exist int he feature layer, before you launch the survey for an existing point.
Phil.