It is going to be interesting to see how they continue to shoehorn turn reversals going forward, because I don't think that is a feature that will be going away, but they are already stretching an in game excuse for it pretty thin.
Honestly the time mechanic doesn't need a justification for it to exist. But if they really need to justify it, just do what they did when they introduced the mechanic in Echoes.
In Echoes, you pick up Mila's Turnwheel as an item and find cogs to increase the uses. A few NPCs make comments about the item, but otherwise it never played an important role.