You do realize that from 72-80 there was only one* defensive cd among all four tanks, Dark Missionary, which should imply the theme of what tanks are supposed to be in 5.0. NF is more utility than defensive but NF was a skill that used to be for IB when in Defiance so I don't even regard it as a new skill but rather a crappier version of something we used to have though 5.3 did fix the ease of use so there's that. Ironically job identity lied in its tool kit which used to vary in previous expansion but was gutted in 5.0. Off tank stances were the biggest proponent of that making some jobs play differently even though they all did the same 123 rotation. DRK had MP to manage as well as buffing skills with DA and keeping Darkside up 100%. 4.0 WAR originally had a penalty to switching, was rectified in 4.2, with the same 3.0 game play that we all loved of maintaining buffs and burst windows self sustains. PLD still lacked originality but was now on par with the other tanks.
Some of the biggest complaints from 4.0 DRk was the DA spam, ironically we are still doing it but its called 'shadow' now. It could have easily been fixed if DA only buffed certain skills. Siphon strike didn't need to be buffed so idk why they let it despite not giving back extra MP if buffed. Dark Passenger could have just been a straight ogcd and Blood Price (which was garbage imo) needed to be a straight lucid dreaming MP regen WITH a possibility on proc'ing extra MP/blood on hit. They also needed to make all tank stances be ogcd. That should have been the first thing they did before deciding to gut it entirely.
I'm also inclined to note that the dev teams want to lower the skill ceiling but fail to proved new players with the tutorials needed for it. All you get is a new skill on lvl ups or job quest and then you are on your own. NN is garbage (at least on my server), Novice hall doesn't explain how each jobs vary and what skills they have vs others, and the tool tips are worded poorly at times. I feel that 5.0 was just them throwing their hands up and saying eff-it cuz I haven't seen a lazier rework since watching PLD's oath gauge in evolve from 3.0 to 5.0. Thank god the story and music is excellent cuz but 2/3 is just a 66% score and that's nothing to brag about.