Ask HN: Why don't word processors automatically add close quotes?

One of the things I like about my IDE - as opposed to working in a word processor - is that whenever you type an open quote, a close quote automatically appears. The same goes for parenthesis, brackets, etc. It was annoying to go back to Word after I got used to the convenience of this feature. Perhaps there is a setting buried somewhere that allows you to turn this on, but I am curious as to why this wouldn't be enabled by default. Is this simply because of precedence or is there a design decision behind this?