Useless feats

[Waterd103]

I don't understand what the following feats do in the game based on that there are no spells of the schools that can be resisted.

Divination spell focus.
Illusion spell focus
Abjuration Spell focus.

[BlueSalamander]

SF Abjuration increases the Difficulty Class of your Dispel spell casting. SF Divination and SF Illusion cannot be selected in the game as they would not provide any benefit.