Oh I totally agree that reading body text is faster with a proportional font! I don't think many people would dispute that. But with code specifically, it seem

Oh I totally agree that reading body text is faster with a proportional font! I don't think many people would dispute that. But with code specifically, it seems harder to see the exact punctuation. You're not scanning word shapes, you have to pay attention to individual symbols. I shudder to think of a RegEx in a proportional font, where a period barely has width. Or how do you deal with a single quote followed by a double quote? Or two single quotes? Or zero vs oh?