Undoing role actions will fix exactly nothing about the issues with healers. Role actions make sense when it comes to tools that you need to be consistent across all jobs in a role, and Raise could've easily been added to that as well. It's an example of where homogenization is perfectly fine. The real issue stems from the ways that their "unique" tools function identically to one another, such as how Asylum and Sacred Soil are used in virtually the same way and do largely the same thing, or to attack the core of the issue, how all healers play their heals in functionally the same way.