I did my thesis porting my supervisor's project from NeXTSTEP into Windows, was an OpenGL fanboy up to the whole Long Peaks disaster.

Additionally Vulkan has proven to be yet another extension mess (to the point now are actions try to steer it back on track), Khronos is like the C++ of API design, while expecting vendors to come up with the tools.

However, as great as CUDA, Metal and DirectX are to play around with, we might be stuck with Khronos APIs, if geopolitcs keep going as bad or worse, as they have been thus far.