I kinda see DOOM (2016) as the tutorial for DOOM Eternal. The sequel isn’t really interested in elaborating or even giving you time to process Doomguys arsenal, it just wants to lob even more new stuff at you. When played directly after DOOM, it feels like you’ve had a warm-up and are prepared to master more advanced concepts like juggling your flamethrower + ice bomb to supply your hp. When played without any of the original, it feels pretty overwhelming.