"museum exhibit" is exactly how Titan lore has felt for years, yeah. The thraegar detail is the part that could shake things up, because it gives the Curse of Flesh a second possible origin without wiping the old story out.
Both, probably. More quest spellpower would at least let the level curve breathe, but the talent tree still needs something that feels like an actual payoff instead of a pile of tiny nerfs and one very moody Lava Burst.