RNG to get high-quality Flower Knight Girls? Fine. Just the nature of Gacha games and you don't really need them if you play long enough.
RNG to get through random nodes to clear the map? Annoying, but it does draw out the game so people don't burn through it as quickly.
RNG during actual fights though (not just skill usage which is also a huge factor)? Come on!

I have lost so many crucial fights solely because my squadrons keep thinking "let's hurt all of them equally! :3" instead of "hey this bug is weakened, let's finish it off so it'll stop hurting us".