What's the rationale? I was thought quite the opposite for logos (re: colors): fewer colors is better, and the logo should be instantly recognizable in monochr

What's the rationale? I was thought quite the opposite for logos (re: colors): fewer colors is better, and the logo should be instantly recognizable in monochrome. It being something a layperson could draw reasonably well is also a good thing. Edit: Did I just miss the sarcasm train here? It's very possible.