Parry...

[MythToken]

I understand all of the above, but the case made for prioritizing dps secondary stats was made under the conclusion that the increased dps was actually a net gain of damage mitigation, over the parry stats damage mitigation.
^ if we assume this is correct then follow me down this rabbit hole for a second.

So IF you are tanking Turn 5+ and your HP pool is not an issue. I think it would be safe to say that migrating a few points out of VIT and into STR would be a significant increase in effectiveness.
Especially if you have now stopped gearing for parry and started boosting crit and det, which will both be further boosted by more STR.

I am not suggesting going +30 STR and 0 VIT. I AM saying that +5 STR/ +25 VIT +15/+15, ect are now worth looking at. Again this all depends on the fight, and your healers.
If you are not dying from boss hits, then adding STR seems like a very legit thing to do. Especially with changing 2ndary stats to dps.

[Kitru]

If you are not dying from boss hits, then adding STR seems like a very legit thing to do. Especially with changing 2ndary stats to dps.

That has always been the case though. The issue is that the content that you actually stand to run is always going to push your eHP because of the devs' love of spike damage. Even if you can reliably survive a DS, you're still basically guaranteed at least once per t5 to get a plummet>auto-attack>DS (or plummet>DS>plummet or plummet>DS with healers in a conflag or...) which still stands a reasonable chance of killing you before you get healed back up. Because you can basically assume that it'll happen, you should itemize around that event.

eHP is one of those weird stats where there is an explicit functional cap but you can never be quite sure if you're there or not because it's both situational and probabilistic. You can only be sure that you've got enough for the 95th percentile or what have you. Since the devs love spike damage so very much, it takes a fair deal of VIT to make sure that you're actually within those top percentiles that you want to be in. As such, unless you're running content that you explicitly outgear, you're better off going full VIT to make sure that you don't die because a dead tank is almost always a wipe, especially in progression content.