I think its all name Reconition. You just associate Gray with Delta, Blue with Makita and so forth. In someways I can't blame them.
I can't remember what two router bit companies it was, but two companies got into a lengthy and expensive legal battle over the color of their router bits. They both claimed it was proprietary because of the anti-friction properties, but in reality it was all about having the color and name recognition.
I see this silliness all the time on my sled. I will be up to the Black Frog eating lunch and see these guys come in all decked out in matching snowmobile gear. Of course when the sledmakers colors change, they have to change all their gear, but hey its more money for Ski Doo, Yamie, Arctic Cat and Polaris.
To a lesser extent you see that in some woodworking shops,where a person as all green tools, or all gray tools of the same brand. I consider my shop a cornucopia of colors
I have no intention of traveling from birth to the grave in a manicured and well preserved body; but rather I will skid in sideways, totally beat up, completely worn out, utterly exhausted and jump off my tractor and loudly yell, "Wow, this is what it took to feed a nation!"