> but even developers of the more recent DOOM games have started to realize that they should return to the original formula of "blast zombies in the face at high speed, and keep plot as window dressing"

There's still a lot of chatter breaking the continuity. In the original, the plot was entirely made up of what you were experiencing directly.

In the ending of the original game, you kill the demon spider brain robot thing and the demons kill your bunny rabbit. That's the plot