I don't see OpenGL only option as something worth using seriously, so not a usable option in practice, if I can simply get hardware where Vulkan works fine. So

I don't see OpenGL only option as something worth using seriously, so not a usable option in practice, if I can simply get hardware where Vulkan works fine. So as a fun experiment, it can be interesting. As something practical - doesn't seem so until all pieces are in place.