First of all, thanks for the answers
I partly agree partly disagree with you. I like your idea "limited powers are easier to understand" but I dont think that the only way would be superpower-abilities. Its one way.
If you simply want to have some kind of hard magic, think on some magic systems of role-playing games, such as Earthdawn. You can have a complex theory of magic, even clear defined rules AND you can have spells and traditional wizards as well. You have rules and limitations and they can be applied in case of hundreds of spells you not even know. So the reader can understand the basics in one book (no need for a 14-epic series , he does not need to know all the spells.
But you are right, a world with limited magical abilities is in some way easier to understand.
I think the point is: how the readery realize magic. In Perdido Street Station by Miéville an entire society is based on magic some way. There is a kind of magical industrial revolution with wizards using theumaturgic engines etc. So the magic has rules unless the wizards could not have used it for building complex devices. But the reader does not know the rules, everything is mystical. So its hard magic in-world, but soft magic as literary tool. Whats more: I think if Brandon had chosen to explain Surgebinding/Soulcasting in WoK it would be a typical hard magic stuff. However we still not understand it, and thatswhy it has a kind of soft magic feeling - a lot of things are mystical.
For me hard magic is a tool or a kind of science. Hard magic is positivism - you can understand the world, you can understand magic. And a tool for the author concerning solving conflicts
Soft magic is atmosphere, a tool for the author to create a world full of mystical wonder. And current -even dangerous - experimenting with spells you cannot understand
I disagree. Partly. Traditional magic is not ability-like, is more or less based on spells. Superabilities are...well abilities you can use at will, that dont require specific knowledge only training.
I think you can have magic that "ts explained with spiritual stuff" and is ability-like in the same time. Think on Soulcasting. In WoR as Shallan/Jasnah is experimenting in Shadesmar, I had the feeling I am in a world of platonic ideas where all terms are glassbeads. Stick, a ship, etc. Surgebinding is more or less ability like for me, however, Brandon created a mystical background with spren and Shadesmar.
Hm..interesting idea. Im not a sociologist to understand literary trends as consequences of sociological trends...but as far as I know fantasy became popular as a kind of escapism-tool. To go away from reality, where things are somehow more simple (more black and white), and where is more "magic" than in our world.