"We didn't expect that so many materials will be farmed in short period of time."
Such an answer is unacceptable. You brought almost the same system to hoto a few months ago. Did the development team of several people not realize this? It brings me the following thought. Either you don't try the innovations you bring more than once, or you don't have any knowledge about the game.
"Every player had the same possibility to farm, no advantage or disadvantage then."
Thinking that the system will not change, I may have focused primarily on doing quests.
Everyone's possibilities are different.
Not being sure whether the system will change constantly reduces the pleasure of the game.
I respect the work you do but this time you have to admit that you failed.