So You Can Scribble Shit on the Screen

Today Microsoft announced (among other things like Windows 10) Surface Hub.
It’s a bigass TV that accepts multi-touch input.
Why is Microsoft and every other company who makes computers with stylii OBSESSED WITH CIRCLING SHIT ON THE SCREEN?!
From what I can tell over the years this is they only compelling reason to use a stylus. I just don’t get why scribbling notes and circling things is so damn compelling.

Update: More scribbling from their product videos: