What i want to know is this. And I doubt we will get a straight answer.

Lets use guild chests as n example.
What you get is predetermined. Proven fact
Is it 100% randomly predetermined. Even with weight factoring for things such as leader cards, that is still 100% random.
Is the predetermined item based off something else which would allow for manipulation by the code to even players out or allow certain players to do better- and if there is some factors to what is picked when it is predetermined, are these factors we control and if so what are the factors
DO we all just get the same progression of items. SO my 100th chest is the same item form everyone else's 100th chest

ANd if its just predetermined WTF show 5 things, just make it so when you click open you get something and be done with it