Give it some time. SE wants us to explore everything in Heavensward. If we didn't have these, people would FATE grind their way to 60, or spamming lv50 dungeons which are rushable in no time. Same as Ixali quest, they're giving 10k exp for 50+ DoH. They just probably will give them normal exp rates after a while. Also 3.0 didn't officially release yet (today \o/) and many people already reached 60. Maybe it's just an EA thing, or maybe until Alexander is released, who knows. Too early to say, but never too late to wonder and speculate.