It may not be that worthwhile, but one function of the replay is the ability to rejoin the action at any particular point in time. For instance, instead of saving every time you think you're at a pivotal point in time, you can proceed through the action. Then, when you got back into the replay and reach what, in hindsight, is a pivotal time (where a different tactic may have yielded better results) you can rejoin the action and contine along a different path. It can be a learning tool. What if I'd have done X instead of Y when I got to point A? Just replay to point A and do X and you'll know.
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