In a proper 4e version, you'd have seperate powers for seperate uses of illusions, aside from rituals which can be more free-form. The system is definitely more friendly to the idea of specialist wizards that have a different flavor than the standard wizard than 3e and 2e were. Partly because the wizard's scope has been reduced: 2e & 3e mage/wizards had access to all/nearly all arcane spells, making differentiation hard to pull off (all 1e illusionist-only spells became mage spells in 2e). And partly because everyone has a custom "spell list" in 4e that defines their combat flavor.