I mean yeah, who would rather spend time at their job helping other users figure out how to include the right add-in for Dropbox to work with their various apps vs how Office integrates with OneDrive or Google Mail, Sheets, et al. integrates with Drive? Thus adding another layer of software to manage updates, etc. At some point, there is an opportunity cost to using siloed products, especially for something that's become relatively commoditized like cloud storage.