Indeed, that is the case we're dealing with: using VoF/ accessories to optimise debuff landing, and even they themselves are RNG in their own right.
What I think Sana is trying to look for is a team build setup that doesn't rely (or at least heavily) on setting up a buff count that hits the debuff cap considering the miss rates. Given that such a team exists, RNG can't RNG you to lose the quest.