In-game the shouts are obviously nerfed. We can't shout down walls or enslave entire countries or split apart landmasses. But in the lore AND in-game,we see much more powerful examples of the th'uum. The greybeards made the entirety of skyrim shake by saying "Dovahkiin". Miraak split solstheim of the coast of morrowind with a shout,and was instantly able to eat a dragon's soul with a shout. He also is able to use firebreath every few seconds which does huge amounts of damage. Also Clavicus vile says that since half of his power was separated from him,the LDB is as powerful as him.Half as powerful as a major daedra. And the dragonborn isn't even fully realized.
Is the LDG more tremendously powerful in lore than what we see in-game,or is what we see in-game a accurate representation?