Quote Originally Posted by Rafaelfras View Post
Spells always prepared is the easiest way to reinforce specialization. 1 spell per level would be a huge into the feel of a specialist. It does this for clerics, newer sorcerers subclasses etc, land druids.
Just worth nothing that the options are far from equal. For example by my count (missing some sources):

Looking at just the current Wizard spell list up to 5th level:
- Abjuration only has one 2nd level and one 5th level spell
- Divination and Enchantment each only have two 3rd level and two 4th level spells to choose from
- Necromancy only has one 4th level spell

Compare with evocation, conjuration and transmutation that each have at least 5 options of each spell level.