The fights are designed with tanks in vit gear. Trouble is we are trying to do them many ilvls short of what they were designed to be. The devs didn't tune A1 to be done at i180 ish, but that's what we were when it was released. So if we are undergeared, then the dps can't meet the dps checks the fight is tuned for. The only way to do it is with min maxing healer and tank dps to augment the crappy ilvl and do it with stuff like penta meld accs and such.
As I said earlier, if you want to turtle tank that's fine, but you will have to sit on you hands until people are at the ilvl the fight is actually tuned for. And considering most players aren't nearly goood enough to beat the fights at the minimum tuned ilvl, you will have to sit around and gear up your team even more to successfully turtle tank with a more avg quality group.
If you want to be part of the elite 1st wave you have to squeeze more out of every job. That means damage. If you have an A rate team you can turtle tank at the designed tuned ilvl. If you're team is of avg level then you will have to OVERGEAR the content to turtle because most people can't hack optimal play.
The fights are designed to be beatable by the best players at a specific ilvl in turtle gear. If you aren't the best team or proper ilvl then tough titties. Get some more gear and/or skills in your team. If you want to push the envelope then you have to lush your own envelope.
If your team is 1 or both of:
*below designed ilvl
*not the best players in the world
Then you will fail dps checks because they are DESIGNED to be harder than what you can muster in that state. The only way to have turtle tanks work in undergearsd/underskilled groups than the fight is tuned to is to soften the dps checks. That defeats the purpose of tuning the fight I'm the 1st place. The tank meta is this way because it's the ONLY way to beat a fight below it's designed tuning. If people don't try fights above their ilvl/skill then you don't have to tank dps. But you can't have it both ways.