According to a report from ixbt.games, a former Rockstar developer who worked on GTA IV opened up about one of the game's most ambitious cut features: a full life simulation system for NPCs. The original vision reportedly had pedestrians operating on individual daily schedules, going to work, running errands, and reacting to the world with a level of autonomy far beyond the "spawn, walk, despawn" loop that shipped in the final game.
The developer explained that the seventh-generation hardware simply could not handle the CPU overhead required to track that many independent behavior trees at once, especially while Liberty City was also rendering dense traffic, physics interactions through the Euphoria engine, and a fully reactive damage model. Something had to give, and NPC depth was the sacrifice. Instead, Rockstar shipped a system that faked density through scripted routines, time-of-day pedestrian pools, and localized triggers rather than a persistent simulation running under the hood.
This lines up with long-standing fan theories about GTA IV's Liberty City feeling "alive" on the surface but mechanically shallow underneath compared to what Rockstar clearly wanted to build. The developer's comments frame it less as a design choice and more as a hardware compromise the studio has apparently been trying to correct for nearly two console generations.
This is the kind of insider confirmation that should get every serious GTA 6 player's attention, and here is why. Rockstar does not forget cut features. This studio has a documented history of parking ambitious systems for a decade or more and then shipping them once hardware finally catches up. Red Dead Redemption 2's ecosystem simulation and NPC daily routines in Saint Denis were, in my opinion, Rockstar quietly picking up the thread they had to drop in Liberty City back in 2008. Now with GTA 6 running on PS5 and Series X silicon, that CPU bottleneck is largely gone.
We already covered this exact trajectory in our breakdown of the leaks describing GTA 6's "completely different" world evolution and AI systems compared to GTA 5. Combine that