Personally I feel we should have a higher item level dungeon for Expert. If you got Expert unlocked then that means you're at max level and are sporting some pretty high end gear and 490 isn't considered as "high end" anymore. In my personal opinion I feel that those 2 dungeons should be included in the normal Level 80 Dungeons roulette where people are still trying to get gear and story progression and for Expert they need to be tuned up close to the current max, like 510 or 520 minimum. We also don't need 490 gear at endgame but some extra rewards that can benefit us at endgame wouldn't go amiss.