It runs macOS and those consumer grade computers don't. If the best colorist in the area is working on your film, you give them the tools they ask for.
The color graders here run 10-bit/color HDR monitors that have a wide gamut. Apple doesn't have monitors that support this. (The new one _might_ do the trick; we'll see.) Everyone here doing professional color work is on PCs supplied by Thinkmate. This is standard in Hollywood, too.