They occupy an important design space between creatures and enchantments that gives them their own unique flavor and mechanics
Every time that you cast a noncreature spell, you can flicker a nonland permanent that you control
Decks with plenty of forests basically get to enjoy a personal Mana Flare
Most cards fit into one of the first five rarity levels, Common, Uncommon, Rare, Super Rare, and Legendary, but certain secret cards have a special Enchanted Rarity instead
It also means that some powerhouse cards, like Witch-king of Angmar, who can force your opponents to sacrifice creatures and even become indestructible, didnt quite make the cut
While this might seem like a waste to some readers, I actually found Torque to be crucial in one of the games I played recently