Dino F
Suspended
I would say you were missing the point
That's kinda like saying "well why have a camera as most people keep their phone in their pockets so all you will get is pictures of pocket fluff"
You would need to take the phone out of your pocket if you wanted to use the thermometer (if it exists lol... speculation of course) as you do with anything else. Also it would have benefits with regards to safety - I have updated the post with some more information:
http://bit.ly/thermometerIn5

The pic you posted on your blog - the very first icon (the blue one on the left) - the window display definately has some kind of dark vertical lines running down the blue on either side. Also, at the top - the lines are joined be a horizontal line as well - looks a little like the top of the Music app icon...?!?