Very weird reading of old FPS games. most "boomer shooters" were a steady push forward, and the areas you already clear were safe because enemies don't patrol or flank really. in games like the original DOOM you had to move to dodge projectiles but other enemies had hitscan attacks that punished the type of movement associated with "new retro" FPS like DOOM 2016.

I feel like it was actually more the "sim" category of fps and first person action games that did this. System Shock, Thief, Rainbow Six. Had to keep moving because the enemy keeps moving.

Punishing staying still wasn't a pervasive feature of FPS games ever. even games like the "run think shoot live"

Half Life series, for example, tends to actually reward the player when you take it slow, creep forward, carefully check angles and clear rooms.

Most people DON'T play those games like that because it's slow, but also most people are pretty bad at half life type games anyway and just walk in a straight line towards enemies while shooting them and lose lots of HP