One of the objective for the seasonal progression is to kill 1 player in PvP.
How not very inteligent someone had to be, to add this into game like Diablo?
You know PvP has 0 balance, yet you add task like this into seasonal progression 
Looks like D4 Devs had 0 idea about the game as well…
That is actually optional. You can progress by doing the other parts. Not saying pvp works just… an option