Judging by your post you know the answer to your problem. If a DPS check is tight, the value of a DPS centric tank's value increases. You'll then work around their inferior mitigation relying on the skill of your tanks and healers, due to the amount of tools each player has access too. There is no other way to work around a DPS check.
If the DPS check isn't as tight - as in a coordination based fight or mechanically complex fight - you'll take something that stabilizes the group providing a larger margin for error, because there are numerous ways to work around fights like that. If a fight includes both in ample quantities, the DPS check always supersedes any other kind of mechanic due to its binary nature (you meet it and there is only one way to meet it or you lose). Truly difficult fights include both. Therein lies the problem. Square wanted to make this tier 'exceptionally hard'. This means tight DPS checks are a necessity.
But here's the real rub, if you start making tank mitigation super important (even though it is still being checked), WARs will simply take the place of PLDs on the sidelines. You can't win either way. If next tier becomes all tank busters and meh dps checks (an easier tier in general then), it'll be the WARs in here doing the exact same thing (80 DPS shouldn't mean I can't do XYZ). The best Square can do is make a tier that has fights super reliant on a DPS check and some that aren't as reliant (but still important), keeping all the tanks relevant. Unless of course you want to make all the tanks the same. But holy hell, I hate that, rather deal with the imbalance.
The complaining is stemming from the fact there are only 3 real fights known to the public with an overwhelming majority primarily doing the 1st, which favours WARs. Essentially, for most people trying to clear Savage as a non-WAR it boils down to "I don't like this tier/boss, it doesn't favour my play-style", which is fine. Coil didn't favour mine, re-rolled a PLD for Hallowed Ground anyway, still had a blast. Now this tier I get to (or was going to T.T) DPS my little tank heart out. This is what it's like trying to clear content meant to be hard, not fair when ilvls are low. You play optimally, not how you like (which for me, is the same thing! Lucky me!).
Honestly I wouldn't of had a problem with tanks not being able to tank any of Alex Sav without vit gear (stricter healer and tank checks). But I can tell you not many people would have cleared it if that were the case. It would also be a metric shit-ton harder to balance for when you consider all of the utility spells everyone has access to compared to a simple DPS check (possibly not very creative on Square's end). For example; a BLM would all of a sudden become more valuable (possibly mandatory, reminds me of Shadow Priest stacking hahaha) for Apocatastasis on A1 simple because your tanks can't survive the tank buster that now does double the damage it does now.
/procrastination!