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No, parallel projects were there before single-action lists.

The main difference I encounter between parallel projects and single-action lists is the behavior in context mode of the Next Action selector. For a parallel project, the next action will be the first available action in the project. For a single-action list, the next action will be all available actions in the single-action list. This makes sense to me: OF treats ordering in a parallel project as significant, in case you do also. Therefore, the first action will be the next action. For a single-action list, there isn't assumed to be any significance to the ordering (because they aren't assumed to be connected in any way except their location in the same SAL) and thus they are all treated as next actions. If you have an sequential action group in a SAL, the first available action in the action group will appear as the next action, and all available actions in the action group will appear as next action candidates if the action group is parallel.