Board Thread:Lore Discussion/@comment-46.208.244.194-20131228112337/@comment-25047024-20131228144259

Likes-That-Tail wrote: 1. Ulfric doesn't trust magic.

2. I would assume no one in Skyrim knows that enchantment, as only 8 humans can shout.

3. Ulfric doesn't really need the extra 20% regen, he doesn't shout a lot. This, and because the Fortify Shout enchantment is probably an enchantment that only Ahzidal or some other Dragon priests could create. And because of Gameplay reasons.