I think the KSP2 team was waiting for the 2021 LTS release for Unity so they can lock features into a stable product. Now we can expect some very cool features in the game related to environments and like it was designed with KSP in mind (I wonder if there was some collab between Intercept and Unity): "HDRP performance upgrades and features like NVIDIA DLSS for desktop, Volumetric Clouds, and Static Shadow Caster." I've seen some pre-LTS environment videos, everything looks absolu