This is a great recommendation and we actually considered it in the past. The team mulled it over for a while and came to the conclusion that a chat box goes against the spirit of the forums, which is to allow our users and readers a medium to discuss games at a thoughtful pace.
We don't have any plans for a chat box at this time, but it's still early days. Looking to the future we would like better integration with Steam and Discord. We'll of course keep you posted on any feature developments.