Idk who's idea it was to have a logout button the same size as the exit button right on top of it during the closed beta, but I got used to having to dodge that button.
Now upon release they had the genius idea of making the logout button smaller and switching locations of the two buttons.
Why it wasn't originally like this, I don't know. Why they thought it was cool to program the placement of the buttons in our head for a month only to change it, I don't know.
I don't want it changed, it's cool how it is, but the amount of times I've logged out is too many, and until I (and I presume many others) can get rid of the habit of dragging our mouse to the bottom of the screen, I will remain slightly disappointed.