[DEV Question] Why is this allowed?

[JunseiKei]

I queue for Dusk Vigil. I'm leveling my DRG. I saved a week or two of Poetics to get the best gear I could get knowing I would likely use it right up to lvl 55 or so. I see a MCH in the party. Lvl 90 relic. A very unhealthy amount of pink aetherial gear from Aurum Vale or wherever you get lvl 49 stuff from. We attempt to kill the first three mobs. I leave without saying anything and take the penalty. Just no.

That's actually fine. Like you said, i130 lasts into The Aery- the stuff you get from there is better, but if need be, you could easily use it into The Vault or Gubal. To put it into perspective, my Dreadwyrm healing coat (not replica) is 3 vit higher and 6 mind lower than the NQ healing coat you can buy in Idyllshire. Leveling dungeons, like Dusk Vigil, are far more lenient. It just really comes down to if people use their skills correctly.