Shades of Green
Explorer
I don't think it has anything to do with intelligence or laziness, but rather with experience with the game, commitment to gaming, and playing styles. New players often struggle with the most basic concepts of D&D (and, if this is their first RPG, with those of role-playing as well) and would benefit from a simple-to-use class with minimal page-flipping and minimal resource-management. Casual players just want to have five or so hours of gaming fun every couple of weeks, but don't want to spend much time reading spell/power descriptions between game sessions, devising cunning plans or learning complex rules. And some players just want to focus on the story, on roleplaying or on non-rule problem solving rather than on the rules/wargame aspect of the game.I like that crap. I don't want a low-IQ or lazy player playing a Wizard (though I do want them to able to play the game & have a good time); I like my Wiz players to be studious types like the class archetype. For the others there's Sorcerer. Likewise I'm smart but I like to be able to play Fighters (or Barbarians) and put my brain in neutral (I used to like playing 1e Elf Fighter-Mage-Thiefs back in high school, but these days I much prefer a simple character).
Variety means that the player could choose the level of rule complexity he's comfortable with in order to have the most fun he could playing the game.