Similar to "Configure fields" in a "Table" in Experience Builder, or selecting fields in a View layer - it would be helpful to restrict which fields can be edited in an "Update Only" View layer.
Why is this helpful? In some workflows, I use Survey123 Connect to create a few forms for different stages of editing. One form shows certain questions and other forms show more detailed questions. It's great for the first form I send to the "Add" only View and I can prevent view access when shared with the public.
However in Stage 2, I have a public form that simply fills out 1 additional field sending to an "Update" only View (I don't want anyone to use that form to submit a "new" record). Now while I can set the other questions to "Read only" in survey123 connect, it'd be great to carry that over to the View layer properties - where the only "updateable" field is that one field etc. Then I don't worry about someone getting into the feature layer View in AGOL and altering other fields.