"One of the basic rules of thumb in typography is that, when writing a piece of text, you should choose one typeface and stick to it." How about an analogy fro

"One of the basic rules of thumb in typography is that, when writing a piece of text, you should choose one typeface and stick to it." How about an analogy from cooking, too? "It's easy to spot all the verbs, but why on Earth would you want to do that? " Well, exactly! Makes it obvious how stupid your argument is, huh?! I'm pretty sure the people who choose syntax colouring know what they're doing, just like the ones who don't use it. One of those choice things.