Coils were NEVER intended to be available without progressing through Crystal Tower, it just got pushed because of some persisting issues that needed to be fixed. But rather than having nothing other than primals and ak, they decided to put coils in and let players bash their heads against it in frustration while they got the rest ready. lol.
So WAR being fully capable of main tanking the highest tier of end-game content wont be enough for you if PLD is still able to mitigate more dmg? I don't see the logic in that. I can understand being upset that PLD is able to do content that you can't but if we both can, then what's the problem?
