>>717153792
I didn't mean Bioshock specifically, just a general statement on the industry. Most game studios had their in-house engines, and they've mostly abandoned them for Unreal. Halo had its own custom engine, but new devs don't know how to use it, so they move on to Unreal.

https://www.purexbox.com/news/2024/10/halo-dev-explains-decision-behind-ditching-its-old-game-engine
https://www.halopedia.org/Blam_engine