Heroes have been nerfed, so there's no real point in restricting hero selection. Also, the growth of birds has been nerfed - Fort: 1, Citadel: 2, Castle: 3. Therefore, they are not that scary with an upgrade. The upgrade of Pixies is tied to the construction of the Resource Silo, so upgrading them in the early stage is impossible, and in the late stage, it's unnecessary. Coupled with this, the upgrade of Magogs is not really imbalanced, so I see no reason to restrict everything exactly as in SoD.
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