I've always wondered why dragons in the game don't even use about a third of all available shouts. It's just weird. They're DRAGON shouts, so how come the ones who the power originated don't even possess it?! I can understand certain dragons having an affinity to a certain elemental power, but that doesn't mean they should only be able to use that particular power. It just doesn't add up. And it makes them as weak as slime monsters.
Unfortunately, the Deadly Dragons mod makes the dragons also summon certain creatures, and that really sounds weird to me. So that's no solution either. I want them to stay lore-friendly.
Yes, I totally agree. It's silly that of all the creatures in the game who can shout, they have the most limited options (with a whopping one shout) and yet
they are the dragons; the Thu'um comes to them as naturally as breathing or existing. They should be masters of the Thu'um by default, by virtue of merely existing according to the lore. And yes, Deadly dragons sounds bad if that's what it does. Besides that, we shouldn't have to mod the game to resolve this: this should be something in vanilla Skyrim, because we all know how annoying mods can potentially be and console players (like myself) should not be stiffed on this.