But they're not archiving your chit-chat with your coworkers over the water cooler. For pilots, they are (in the cockpit). So I can halfway see the pilots' point.
[Edit: I mean, voice chit-chat. Just talking to each other. That gets recorded for pilots, and not for software engineers, no matter how long they keep our (text) chats for. Stuff gets said in person, by voice, that would never get typed out in a chat.]