Rose didn't care for battle, Ruyue did it out of necessity, and Iris was experienced enough to view it as a sport.
The only one among them who really enjoyed battle to its fullest was Elena.
She was also the only one who had any particular excitement for the war itself, rather than just the things that came along with the deployment notice.
Elena had multiple purposes for leaving the palace, but fighting Straea was one of the main ones.
This was where Rose and Ruyue differed heavily. Even Iris wasn't so much interested in the war as she was in the side quest she'd given herself recently.
Obviously, they all knew that the war was important. When Straea was gone, Void Palace would be able to expand its rule far more than ever before. Moreover, with all internal enemies gone, they could properly focus on the Foreign Races.
However, they just weren't strong enough to make a real difference.