AMD has Mesa drivers for graphics, which are better-optimized than Nvidia's proprietary Linux Vulkan drivers. It can be fixed in software, but Nvidia's only barely started to catch up.
The focus for Nvidia's GPU stack on Linux is getting CUDA working, which means that some traditional raster features get neglected.
I'm not aware of any commercial CAD/CAM software running Linux that Nvidia would have a money interest in supporting. Which current CAD/CAM is running on Linux with graphics? The closest I'm aware of it FEA packages allowing remote calculation on Linux machines while the GUI runs on Windows. Is that what you're referring to?
The focus for Nvidia's GPU stack on Linux is getting CUDA working, which means that some traditional raster features get neglected.