Accessibility requirements for materials should always be decided by the needs of your students and the requirements of the department/faculty to comply with University guidelines. Not all accessibility issues impact all students. In most cases, amending materials will be a gradual process as course materials are updated, and no immediate action will be required. Ally reporting can be used to help guide this process. Ally can also be used to guide course content creators to produce materials that are accessible by default so that no more work is required.
Who will edit courses will be decided locally based on existing working practices, staff availability, and team structure.