It would be nice to have the ability to use a hosted table or CSV as a domain for a feature layer. This would be handy when you have multiple feature services that have identical domains. That way you would only have to update one table, for instance when adding a new domain value, instead of finding each feature service and updating each individual domain.
Similar in concept to how Survey123 allows you to have non-domain fields, and use a CSV file as a choice list.
