PnP HW doesn't translate to DDO well at all, because terrain hasn't been built into quests from day 1. And there's no way that SSG is going to audit every single quest and add in terrain attributes just for HW, because the juice isn't worth the squeeze.
Even core pen and paper abilities like Dimension Door are neutered by the translation to digital gameplay.
A sprinkling of +2 skill bonuses based on terrain is mostly meaningless in DDO. Even if every other core provided +1 to all skills, it would still be meh.
Favored Enemy is the only existing nob the devs have to work with.