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Initially, mirror maps were created, among other things, to reduce the number of restrictions in the rules. This was the goal of the developers, and mirror maps simply reinforced it. Therefore, they were played on the principle of "everything is allowed."
In SoD, this goal is not feasible, so the question of restrictions in relation to mirror maps is debatable, and both opinions are reasonable.
An obvious disadvantage of "everything is allowed" is that if there is a Necropolis starting town, and one player gets the Necropolis, while the other doesn't, the second player is at a disadvantage; the amplifier is merciless.
However, the argument about the overpowered Amila, in my opinion, is far-fetched. With the same argument, one could prove the imbalance of the mirror map: "I ran to the Treasury through a nearby, obvious guard post and found nothing, while the opponent rushed down a long road through dense guard posts and found everything." I hear similar arguments from time to time, but I think it's ridiculous.