I also think it's because of Mesa, it's miles ahead of Intel drivers on Windows (well, at least for their older iGPUs, can't say about the newer ones). For example, the Intel HD 4000 from my laptop is limited to OpenGL 4.0 and DirectX 11 on Windows with the Intel drivers, but on Linux with Mesa you get OpenGL 4.6 and even Vulkan support with this iGPU...
Avell A70 MOB: Core i7-11800H, GeForce RTX 3060, 16 GB DDR4-3200, Windows 11 (Insider Preview)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)