Tanking in SHB is braindead easy right now and with the simplification of the jobs any tank is to easy to pick and master for the good and the bad, DRK and WAR are the most simple and less complex tanks of the moment, pretty easy to pick and use, the jobs are just to simple to operate you basically will spend a lot of time watching netflix when playing with them when you know how they work and turst me DRK mp management is as easy like PLD since the usage it's almost the same, PLD and GNB are more rigid and complex to play and require to stay more focus on they rotations but not so much compared to WAR and Dark WAR, still very rewarding to play when you now how to use them so if you feel atracted by PLD give it a try, all tanks are way more simple than any of the DPS so there is no wrong choice for casual tanking.