Why do they try to make tanking harder?

[Sove92]

GLD is just balls at tanking in lower level dungeons anyways. It requires a lot more effort to be effective than MRD.

This is true especially since the introduction of duty roulette. If you queue into a lv <30 dungeon with a job equipped, you don't lose the stat bonuses the job gives you (you neither lose any of the 30 points you can set that you have acquired). If the tank is a GLA, they will have a much harder time keeping hate on themselves. MRD has easier time with their higher dps and Overpower, but it still takes more effort.