You play PLD? Because I don't see it. All I see is WAR 60.
I don't know if this is your alt and you have a geared 60 tank class doing end-game content, but a lot of what you've said just seems irrelevant.
1. Tanks don't "roll" their cooldowns in any content that matters. They time and stack them specifically to mitigate encounter based tank busters. In that regard, all the tanks are the same in practice.
2. Mitigation or HP are all the same thing. They're all just part of a larger eHP calculation and in that regard, the three tanks are, again, virtually equal. It's not coincidence, they were designed to be different but equal.
3. When SE tuned content, they did so factoring in 20% human error. Meaning that compared to their perfect set-ups, human players were expected to be at 80% efficiency. The best of us exceeded that by SE's own admission. So yes, dummy parses are dummy parses. But, when you have done the same fight hundreds of times and the same rotations thousands of times with the only goal being to perfect your play, you get pretty close.
4. You'd probably have to dig deep to find a comp without a WAR / NIN / BRD / MCH. But, we can easily show you one without a PLD. Rage of Halone's debuff isn't even kept up by PLDs in most cases. It's that meaningless. BRDs singing for 1 person is a DPS loss. Bringing a NIN to a group that has a PLD / WAR set up means you lose the INT debuff unless you bring NIN / MNK and that would be a DPS loss because of no DRG (top DPS + piercing debuff for BRD/MCH). You notice what's happening? You quickly get pigeon-holed into comps because of balance issues.
5. Yea, there will be statics and PF groups that still take PLDs. There are also a lot of statics and PF groups that don't because they view the job as weaker than DRK and WAR. The same unfortunately goes for MNKs (an unfortunate victim of PLD's weakness) and ASTs. It's not a healthy situation.
New to this tier is an apt description because you really have no clue what you're talking about.