If there is one game dev studio which can do big cross-platform QA (console,"linux" PC,macos,mobile?,etc) is them... so... it looks like lazyness, or they are sleeping with microslope in the backroom, since they would be the only beneficiary. We all know that with current modern 3D engines, serious and honest work, the only thing which can be tricky: conservative 3D programming which does include the shaders (lower the level the better).