Alex. St John: "Direct3D, OpenGL, Metal, Full Circle"
Time: "DirectX Creator Says Apple’s Metal Heralds the End of OpenGL"
According to St. John: "Nearly twenty years later OpenGL still sucks for games, OpenGL drivers are STILL consistently broken across devices, OpenGL is still driven by CAD applications".
BTW - I'm no longer at Valve or working on vogl. And no, I'm not being paid by, nor do I know anyone still at Apple, lol.