Can a programmer only use one langauge?

If not, then why is the main argument for using D built around "switching"? Seems to imply there's some sort of battle. It also gives a certain negative feel to D, as it's trying to conquer other langauges. I would prefer something in the lines of "Why use D". --Kraybit (talk) 10:56, 22 November 2012 (CET)