On the matter of Healers and Tanks from Ralph2449's Post, unfortunately, those two Roles are quite badly designed compared to the Dps Jobs, in both pve and pvp content.

On the matter of Healers, theyre in a technical sense, all the exact same as WHM is. They have way too many Healing abilities (14 for WHM, 11+3 from SCH because of Fairy, and 11 from AST) and not even a handful of attack skills (one basic attack spell, one aoe, one dot is the norm. WHM gets a discountprice foul and SCH has Monster Energy Drain which Squeenix really hates from the bottom of their heart. AST used to have lord of crowns dealing damage but isnt allowed anymore because people had memory issues memorizing every single card having a different effect, so now its just flat dps boosts.)

On the matter of Tanks, theyre using the Warrior Job as a reference of designing the rest of them. if you compare the skills on paper right next to each other, you will notice that theyre all basically the same with very few minor changes, like the immortality buttons like living dead, holmgang, panic bubble and Superbold having slight drawbacks, except for PLD because of special privileges, and gunbreaker having a additional dps rotation compared to the rest of the gang.

As for PvP, oh boy where do i even start. PvP in this game is designed arround TEAM focused fights, not man-on-man combat so you can pretty much guess you share on this already. to keep things short, Healers are the actual tanks in pvp, Tanks are just bullies knocking people off ledges or just being a mild annoyance and DPS is cannonfodder, Ranged dps is everyones favorite because attacking from a distance, while melee dps gets for the drawback of actually having to walk into the face of everyone else a massive dps burst that melts anyone in hand-to-hand combat, especially if limit break is used.