Sorry but the fact that tank balance was so good last expansion, current balance is unacceptable and no the paltry potency increase on PLDs Requiescat phase is not where it's needed, and it's nothing short of a HW 2.0 token buff, looks like they're doing something but actually doing nothing to actually address the issues.
As far as dungeon balancing, nah that should have absolutely 0 effect on how jobs are balanced. Sure WAR can be a powerhouse in dungeons via self sustain, but at no point should that penalise the job in the content that actually matters.
Criterion dungeons, we have to wait and see, I don't think personally, WAR will have that much of an advantage over the other tanks, sure it's self-sustain is strong, but I reckon we'll have to go with smaller trash pulls weakening Bloodwhetting strength by some degree.
Overall no job should be pushed as a dungeon job or a raid job, has never really been a thing in XIV and rather it never go that way. Again their own words, any job and any comp, can clear any content, means SE need to actually start doing more substantial adjustments to bring the weaker jobs up to an acceptable balance, so people can actually not feel like a detriment for play the jobs they love to play.
HW PLD existed once, it does not need to exist again.