It's a constant reminder that power has a price. Every class comes with inherent weaknesses or drawbacks, often tied to vampire myths. A 'Sunforged' class might be incredibly powerful but cause extreme photosensitivity. A 'Beast Aspect' class could come with loss of control during emotional spikes. These aren't just balance mechanics; they're narrative constraints that force characters to adapt and cover their flaws.
A protagonist who is powerful but has a glaring, known weakness is more interesting than an invincible one. Enemies will exploit that weakness, allies must compensate for it, and the character must constantly strategize around it. The class system ensures that no one, not even the top tiers, is ever truly safe or comfortable. There's always a counter, always a cost.