Hello @yaay, thanks for sharing your comments.
At the moment, we don't have a universal solution as each use case is unique. For instance, some projects were initiated during the early stages of Slice Machine when both builders could coexist in a repository. Others have a toggle to select whether to work with the Legacy option or Slice Machine. Now, not all repositories have access to this option.
Right now you can only choose between Slice Machine or The Legacy Builder right when you create your repository.
Having a project with Legacy Builder and migrating it to Slice Machine may result in losing content due to potential conflicts with Slices' structure.
Therefore, we highly recommend that all our users begin using Slice Machine right from the start of their projects and continue using the Legacy Builder for their older projects.
We're continuously striving to enhance the user experience, but we don't have any updates yet regarding the release of a migration guide or tool. We understand the inconvenience this may cause and appreciate your patience.