To use the example of Go, if you make the board bigger, you will have more options for making your move, and the game becomes strategically deeper.
This example has one critical problem, in that by expanding the board you do not create new types of moves a player can make, but rather the directions existing moves can be made in.
Which is exactly what I advocate: even if there is only one spell, there can be plenty of variety from how it is used.
Which only proves that despite what you opened with, my position is in fact, a fact.
