It was promised as a feature in Stalker 2 but many players have noticed it seems to be absent.
Over the weekend, GSC insisted the simulation is technically present in the sequel.
It’s just broken.

“A-Life 2.0 is a simulation system for life in the Zone.
A-Life is what makes Zone truly alive and unpredictable.”
If that is currently present in Stalker 2, it’s hard to tell.
It’s not the most intelligent spawning system, but I guess it does keep you on your toes.
This leads to confusion and mixed expectations among players about what the feature actually entails.
It presumably takes tweaking both to make the world feel inhabited by competing groups who wander around.