So what you are saying is, since we need to do speed runs to get the heavy darklight body its not RNG? Skill is a determining factor on how the chest pops after all.
It is still RNG,, regardless if performance increases our odds or not, and in all honesty there is no excuse for people to not get above 50k points now that we have figured out the pop requirements for the last mob and there are genuine strategies out on how to do it other than the hamlet being at level 1. Even the shittiest parties can go in and let the npcs do 95% of the work. I have seen them do it.