it is dumb the silver chest cost exactly twice as much as the brass one and makes exactly twice as big award that means that there is no benefit to saving for the larger chest it gives you nothing special
I'd rather just restart on the level that I lost on rather than go back a level. Sometimes a previous level can be super challenging and going back to it (again) creates a sense of disappointment. That's what compelled me to stop playing, FWIW.
Yeah, maybe I should add something in the game, where you get insulted by your raid, when you fail ;)