DISCUSSIONS on “Rules for online games in HoMM3 and formulas for calculating player rating.”

That's exactly it – it's about limiting excessively significant advantages. Tazar Galtran... the summoning portal, mana doubling, etc., are far from a guarantee of victory. But the Orator's Hat, Wings, and Book of Earth – that's already a 90% chance of winning. If you see the Orator's Hat on the 3rd week, you can kill a few dozen minotaurs and then jump around the map, blowing everyone up. But limiting magic with Wisdom and GM at least balances this out somewhat. Angel Wings in the first month are also a very significant advantage. And in the rules, there's all sorts of nonsense like banning the upgrade of pixies, but more serious things are not limited in any way.