You acknowledge that Vulkan is too low level for people who aren't investing billions into an AAA graphics engine. And you surely know that OpenGL and Vulkan are the only two cross-platform graphics APIs. Are you sure you can't infer why people like OpenGL from those two points? Especially in Linux-heavy communities where DX and Metal aren't even options?
I assure you, none of the "love" for OpenGL comes from the elegance of its design.
There should be more effort to support Direct3D under Linux. We have Wine and DXVK, but it should be easier to integrate the D3D support into Linux applications.
I assure you, none of the "love" for OpenGL comes from the elegance of its design.