I'm not sure what you're trying to say here.
Raid buffs don't make exploiters (non-buffing / pure personal damage jobs) redundant. Having more exploiters or fewer (outside of taking single-target buffers) is irrelevant, as a job of half party-wide buffers and half exploiters will tend to perform equally to a job of all party-wide buffers as long as their rDPS is balanced. Single-target buffers, though, need ideal buff-users, specifically, in order to maximize their rDPS; AST and DNC would waste rDPS potential without a job each with maximal 2-min burst and maximal between-bursts damage (such as on BLM, SAM, MCH depending on timing).
Whether PLD has higher aDPS relative to its rDPS or not (i.e., whether it makes better use of buffs and therefore grants its buffers more rDPS) makes no difference to exploiters, and therefore does not upset any balance the likes of a MCH (or any other exploiter) would care about.
It merely makes it easier for PLD to be balanced simultaneously for 4-man content and 8-man content. Previously, for PLD to have aDPS parity (which is the parity one should be focused on in comparing tanks' damage, or any that of other selection of purely exploiters), it'd have to have a significant lead in rDPS and be overpowered in 4-mans. Now, they need simply turn the tuning knob to put it, say, just above WAR in both rDPS and aDPS.
As for gameplay, that is almost entirely a separate issue. Goring Blade did not have to be gutted for PLD to get use out of raid buffs more equal to the other tanks. It solely required compressing its burst phase. Yes, change Goring Blade from a 3-GCD skill to a 1-GCD skill compressed that (by 2 GCDs), but they could as easily have had FoF grant 3 stacks of Atonement (a compression of 3 GCDs), or even just left it at the Requiescat phase going directly into the Confiteor combo (already a compression of 4 GCDs) and FoF applying to all damage.