I don't think anyone who works in the industry thinks that OpenGL or DirectX (pre-12) are "fantastic graphical APIs" unless judging solely on install base.
Everything I've heard says that Vulkan and Metal both are far more efficient, let you get more out of the hardware with less CPU time, and can more easily support newer features.
OpenGL as a major target platform is dying, it's just a question of how long the tail is.
The problem is that Apple did not follow the natural death curve of OpenGL (which is generally in favour of Vulkan, and libraries built on it), they just completely stopped working on supporting new OpenGL extensions and versions since 2010 (!), and didn't have metal macOS until 2017.
Even from the perspective of bringing people smoothly to their proprietary API, they have failed miserably.
