Some of this is marketing. Lumen is really nice as long as you never hope to have >60fps and don't want open worlds. The architecture of it is just fundamenta

Some of this is marketing. Lumen is really nice as long as you never hope to have >60fps and don't want open worlds. The architecture of it is just fundamentally not compatible with the majority of AAA games, especially open world or esports ones. It's not that Epic are stupid it's that they're "optimising" in all directions and it sometimes causes issues. -- marketing advertises features that are not fit for the purpose they're being marketed for. Lumen is excellent for small games that aren't so CPU heavy or alternatively for non-realtime renders such as scene generation VFX. Unreal itself is extremely bound to single-core CPU performance, so the idea of adding extra weight to the main render thread (which is basically the only thread) is unconscionable and was a deeply unwise decision.