The point of explorable modes was to give PvE players a challenge that they can do even at max level so the content doesn't quickly become completely obsolete. With the downscaling of levels they need the level 35 dungeons to still be challenging for someone who is level 80 with level 80 gear and traits and skills. So if you can't complete it at level 40 with okay gear and half the available skills/traits, then perhaps try coming back later.