All hardware capable of running macOS 10.14 (Mojave) have a Metal-capable GPU since Mojave requires a Metal-capable GPU. OpenGL support was officially deprecated in the 10.14 SDK.

When we roll our minimum macOS SDK to 10.14, we should remove the fallback for older macOS hardware and only use the Metal backend on macOS. This will reduce app binary size, team maintenance burden, and testing matrix.

Related iOS issue: #103929