@Pendryn I wouldn’t put it in those terms. It’s more like they haven’t decided whether magic should be common or rare. For example, would it be possible to train every villager to levitate blocks to and from locations (this would be on the extreme side of common, call it “Magic Level 10”) or should it be reserved for boss wizards and rare staffs that have special effects (call this “Magic Level 1”, an extreme form of having it rare) or will it be somewhere in between? I think magic will play “major role”, but the question is how saturated in the game world will it be?
I personally think this would be a cool option to have at the start of your game. One mechanic you could have is a concept of some sort of “magical crystal” and until you find this crystal, you can’t make magical units. However, the crystal can only make a certain number of magical units because it has limited power. So when you start the game, you could set these crystals to being a “high occurance” or a “low occurance”. The faction that has crystals could become very powerful, and could sell them to others or use it themselves. This is a rough concept, but it’s just an idea.
I don’t want to have all my units be wizards/clerics, but I want them to be on the battlefield next to my archers, etc.