I always felt like dodging projectiles and not needing to worry about vertical aiming was the best part of doom.
It also translates to controllers well too vs the hit scan skills required with modern fpses along with the ability to aim on the vertical axis
he was like 24-25 when Wolfenstein 3D came out (having designed like half the levels) and continued on, being an integral part of Doom, Doom 2, Hexen and Quake