The tank gets hit by the same mechanics the rest of the party does 90% of the time, except they can just ignore it because...they're tanks. It's not as dramatic right now that everyone is running around in grey/green MSQ gear and tanks are actually fairly squishy-ish, but in a few weeks, we'll be back to them needing to have 5+ vuln stacks to be in any kind of danger. It's not skill if you can just ignore mechanics and get away with it.