Co-dependence is relying on others to provide what we are not providing for ourselves.
In traditional MMOs, this is exactly what the Trinity is designed to do. We can’t fully provide for ourselves. Just sit in any city or population hub in a traditional MMO and look at general chat. Try to find a dungeon group as a DPS player. How long do you typically wait? How many times do you see phrases like “Looking for Tank” or “Need Heals” scroll by your text window? The level of specialization offered by the Trinity comes at a price.
Independence is being self-reliant and completely capable of providing for your own needs.