what I hope for 4.0 Battle System

[Shurrikhan]

You oversimplified my ask. I have made plain I want the meta to shift from DPS focus to "role-like gimmicks and DPS". Also I asked for nerf to tank buffs and heals or increase in dmg and healer specific mechanics. It's in the OP.

And actually the way I have insisted would require more DPS from dps jobs if the checks were left as is.

I mentioned those, and simply pointed out why that's doesn't need a direct meta change. You just need to develop fights with more gimmicks (or, really, just to add on additional utility and indirect output skills come levels 61-70). You don't need this kind of rebalancing. And you have yet to mention a single concrete extent of where what you're hoping for will actually end up. But what you have listed isn't even necessarily a nerf, only something that will widen the gap between tanks and non-tanks as the expansion progresses:

TANK:
pld, war, drk - roles that are forced to take dmg, hold aggro & mitigate party dmg PRIMARILY. I want higher dmg on tanks forcing us to use optimal mitigation sequences. I want all mitigations to be influenced by stats for example no longer flat 20% for Inner Beast, but instead a 15% base mitigation that increases with determination and can CRIT! Same with all other mitigations (Rampart, shadowskin, foresight, etc, etc). I want there to be 3 types of tanks: Parry/DET, DET/CRIT, & Parry/CRIT.

So where will it be at the end of the expansion? 20% 25% 35%? And what the heck am I going to do with a 30-70% "critical" mitigation? That might not be an issue, but then, why?

It would also mean that the difference between tanks and non-tanks is relatively small early expansion and potentially vast late in the expansion, possibly causing multiple "metas" over the transition. Would that be intended?

And if you do want the removal of tank heals as well, then does that really mean you want them to be dependent on percentile damage alone? Because that runs the same risk of the tank being removed in content that would have little damage taken, unless you specifically do not make content that has little damage taken, whatever the (non-tanks') gear level.

If you do in fact want:

HEALER:
ast, whm, sch - roles that are forced to constantly heal, regen, cure negative status effects PRIMARILY. I want Healers that have much weaker heals or party takes higher dmg than the nominal HPS. I want more status effects during fights that require healer attention (esuna, adlo, etc). I actually want ast to lose its offensive buffs….no balance or arrow. I want offensive buffs left to the support roles.

Then how would these fights be rebalanced, and what does AST then have left to balance it against WHM and SCH without being 95% a carbon copy?