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> noob here - how come no one is making a cross platform API to abstract away this stuff?

... but there are hundred of cross-platform APIs to abstract this stuff - unity3d, unreal engine, qt3d, etc...

Unity or Unreal aren't 3D rendering APIs, they're game engines

Vulkan is supposed to be the cross-platform API, but Apple isn't supporting it (and doing their own thing with Metal, as per usual). From what I've heard, Vulkan was originally "OpenGL 5" so while OpenGL continues to exist Vulkan is effectively its successor. There is MoltenVK, which allows Vulkan applications to run on top of Metal.

SFML (Simple Fast Media Library) and SDL are cross platform and hide most of OpenGL boiler plate. I've used SFML but just to make Shaders and output some text.