Search and Rescue Teams do most of their mission reporting in USNG (the National standard according to FEMA) or UTM and without this option they will not adopt Survey123 for their mission data collection.
Currently the Mountain Rescue Association are using the GeoForm to report their mission location - sometimes all they have is a report of where the person was rescued or last known to be and it will typically be written in UTM coordinates (see below).
They would like to use Survey123 Web for the conditional logic so they can speed up data entry by using "rules" and for the built-in reporting / analysis features. They do not have a developer and are a volunteer, non-profit organisation.
There are probably other organisations looking for this capability - so I was wondering if it is in your development pipeline? Should I add this to the ArcGIS Ideas page?