I know its random but last season I got a lot more essences drop. The season before it (before they changed the droprate) was about the same as it is now ..
Did a few runs now and only 1 or 2 essence dropped per run. Yesterday I even had one without an essence drop.
Are you trying to make conclusion after 2-3 runs? Really ppl stop spam and complain for every single thing that pop up in your heads. I got 10 runs without essence drop in a row and runs with 10+ in a single run.