[xypage]

My guess would be that it's because spoken languages and programming languages are fundamentally different, so in trying to make one fit the other you might end up with a programming language that looks and reads a lot like English, but it's almost become self obfuscating because now your brain could automatically try parsing it using the rules for English and not the rules for the programming language, making things look like it should work even if it doesn't. The example the comment you're replying to works pretty well, we probably largely ignore punctuation at the end of sentences in terms of actually consciously seeing it as opposed to just inserting a pause in our mental cadence, so if they're suddenly important pieces of syntax in statements that look like English you could easily start messing up the use of it