It would be nice to be able to add a calculated column to hosted feature layer. So that as other attributes change the calculated column changes when necessary. Exports of the data could export the calculated value.
For my use case I have pressure readings and thresholds, and I would like to have the status determined from the readings. I can add Arcade expressions further up the chain, in a web maps, or dashboards, but it would be nice to go to the feature layer ->data -> add field, choose "arcade" as the datatype, and then enter the arcade expression for the new computed field. Adding a field and calculating it becomes an issue in that one could easily update the reading and forget to recalculate the status. Tying the value in the field to the expression saves a lot of QA and QC.
As it is now in my pressure dashboard, I have hijacked the OBJECTID to display the status. After adding OBJECTID to the table, I update the label in the header and then use advanced formatting to display the status. It would be nice to persist this calculation on the very row that determines it.
