They're RNG-heavy, yes. It's always been that way on the original. As stated in previous pages, it's impractical to spend stamina on them as long as the blooming system isn't around.

Also, "World Defensive Yada Yada" is a mouthful of cringeness. Why these English devs had to make it "fancy fancy" when it's just translated to nation-based mission on DMM is beyond me...