[daphreak]

Just guessing, but I don't think this system controls the robot with the computer. It may command it, but the closed loop control is probably not happening on the Mac. At that point your interfaces have much looser requirements.

That segmentation is very similar to hobbyist 3d printers.

Looking at the solutions they sell my guess is that the system is expensive enough that adding an iMac rather than some other consumer PC doesn't change cost too much.

At that point they probably picked the platform they were most comfortable developing on. Going back to the first blog post shows that the author prefers Cocoa for developing GUI's and the bio states that he is CTO of the company.

Again, all speculation, but thats how I'll rationalize it until he tells us different.