While performing a CSV import as a user, the option available during field mapping is a lot less (restricted) compared to the options available to Admins. Having the non-admin CSV importer mirror the same functionalities as the Admin CSV importer would be a useful functionality that allows users to map issues properly during import.

Example field: Watcher

Notes on the different importers

Non-admin CSV importer

• Documented here: Create issues using the CSV importer
• Accessed by going to https://<your site name>.atlassian.net/issues/ > Click three dots > Select Import issues from CSV 
  
• Can only be used to create tickets

Admin-only CSV importer

• Documented here: Import data from a CSV file
• Accessed by going to https://<your site name>.atlassian.net/secure/admin/ExternalImport1.jspa
• Can create tickets and users