This is not a stupid request.  Whether I work in a secure area with sensitive data, or am in the ladder years of my stellar career at a big corporation, I will ultimately use my phone as a way to share media with those around me.  If you are showing someone a video/pic/map/game from your phone, and a text comes in, they can read it.  That is a major issue, and I can only hope that Microsoft address the issue soon.