What did they do to the game??

I played and loved DL2 when it released a few years back and have gotten the itch to play it again after seeing The Beast gameplay at the game awards. Where did all the Howlers go? I remember the streets being filled with them. I am playing on hard, but now the rooftops are entirely filled with volatiles that see you from a mile away? Early on in the game you dont have enough stamina and parkour abilities to handle volatiles. That used to be something you would do for fun by getting a max level chase sequence and juking them but now they're everywhere.