One particular one I've struggled with only appears on macOS with Intel Iris Xe GPUs in which the texture sampling in my default, high-performance, seamless sky

One particular one I've struggled with only appears on macOS with Intel Iris Xe GPUs in which the texture sampling in my default, high-performance, seamless skybox renderer bugs out and only makes one face of the cube render correctly. I have to fall back to physical geometry to fix it, which is not as efficient, causes ugly seams at the edges of the cube, and also overcomplicates handling transparent images and image alignment if I'm not very, very careful. And my app isn't even all that complex. There are so many bugs to handle, but luckily Three.js handles the vast majority of them for me. You can't count on even very basic apps to be completely compatible across all devices.