Simulator support for GPU rendering is far from trivial so it isn't about "bothering". Metal jobs are packaged up along with shaders and proxied out to the host macOS Metal framework. Textures are backed by IOSurfaces which do some fancy Mach memory mapping tricks to share memory between your app in a simulator, the macOS side of Metal, and sometimes GPU memory (on Intel Macs with discrete GPUs). For the most part this is transparent to you and works even when Simulator vNext is running on macOS vPrevious.

The vast majority of developers are using higher-level system frameworks, an engine that has a Metal renderer already, use WebGPU, or use Metal on Apple platforms.