Age of Wonders wishlist:
Ability to choose the summons I get from spellcasting. I believe a mod on Steamworkshop has fixed that, but all the same.
Better developed underground. I’ll admit that area would normally be disabled or completely ignored in my games.
Expanded races. Basically what you were saying @BloodyBattleBrain about the asymmetry.
Better city development. AoW3 with expansion really shined in terms of specialising cities for certain unit production. I’d like to see an option to adjust the landscape better around the city.