A useful, common task for myself and those I supported in our user community, was adding point data via CSV file to a map. In the new map viewer, I only see an option to add from URL, where in classic viewer you can add from a file (on a computer). Do you expect users to load their data onto OneDrive or other cloud storage? If there is no option to add CSV from file going forward, you will leave a lot of people behind (when classic viewer is no longer available), especially those new to AGO and web mapping. Thanks for considering this comment.