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Well, firstly, if the save is indeed very old, I don't see anything wrong with the replays. Adjusting the map and making extra moves are all understandable... but considering that it's impossible to track whether a player (e.g., a blue player sitting in a town and replenishing mana) used a replay, introducing such a rule seems quite silly. Let's also ban screenshots of replays, as that's also an "imba" advantage – they don't even need to spend mana! Ultimately, it won't be possible to take advantage of the replay information at the end of the turn; it will just be information for the future, and even then, it won't be complete. For example, those who don't stream their games and complain the loudest about this being forbidden are often the ones who do it the most (or used to do it). I'm almost certain that a cunning player does it whenever possible, but they need to write about it on the forum.
P.S. There's a lot of fuss over nothing, in my opinion; Butch is just whining.