Another example of that is the way the Grand Campaign forces the Wood Elves to stop being isolationist and expand like everyone else. The demands of Total War sometimes don't mesh with Warhammer's fiction. At the start of the campaign I was allied with my ancestral Dwarf enemies and at war with Bretonnians for no good reason. The talking heads of the diplomacy screen sometimes scream “Traitor!” even while allied and at high friendliness, and factions offer money to join wars every turn no matter how many times I say no.
This encourages a mix of warmongering and treatymaking, the latter of which highlights one of few disappointing things about Total War: Warhammer-its diplomacy. Amber is not renewable like gold and has to be spent carefully-high-tier units, buildings, and tech all require it. The Oak uses a new resource called amber, which the Wood Elves acquire by conquering settlements, making alliances, or finishing quests.