They removed it because it was an ability that literally required the user to aim at the floor with enough potential damage to kill a tank.
He was a bad hero with a broken mechanic holding him back so they reworked him into something that had more potential in the hands of a skilled user while being worse for people who could only hit shots by aiming at the feet
Doom is different because he’s just weak with no blatantly busted ability. People like you hate him because he takes advantage of match ups and lack of awareness. That’s not doom being strong or anything, just the player being bad or in a bad situation