The “Change Benefit” stated in Release Notes for the changes to Files is the following: "This update offers a cleaner, more intuitive interface that simplifies file organization and management. Improvements like pagination, sorting, and streamlined selection tools enhance usability, especially for users working with large file sets." How does moving away from familiar design paradigms used in many applications like moving files by dragging and dropping them and using Ctrl+A / Cmd+A keyboard shortcuts for selecting all items make the interface "more intuitive?"
If the rationale for removing these features is that they are not usable or accessible to users of assistive technology or certain devices, I disagree with that approach. If a feature currently requires a specific type of interaction (e.g., mouse click) or device (e.g., computer with connected keyboard and/or mouse), it should not be removed. Rather, the feature should be modified such that it works for users accessing the system with other modes of interaction or devices, or an alternative method to complete the task that is equally effective should be added to support those users. It is possible to integrate accessibility into interfaces that offer drag-and-drop functionality, for example, as described in this blog post from the Paciello Group (TPGi): The Road to Accessible Drag and Drop.
Additionally, removing features that users have used for years with a relatively short timeline between the announcement and implementation of the change makes it difficult or impossible for institutions to do change management and warn potentially affected users.