Matthew Mazzenga
New member
The arrow lets new users know that the they can scroll sideways, which isn't otherwise noticable. (Note that MS went out of their way to make the arrow bounce rightward when at the top or bottom of the list to draw more attention to the ability to move sideways to the full app list.)
The size of the live tiles isn't about to change without advance warning because thousands of developers have built apps (including push servers) all expecting a 173x173 canvas.
Regardless of tile size, I'm just saying maybe that space could be used for something more than an arrow. Having it there to show a new user that there's an app list to the right is a lame reason to have it. New user only needs to be shown that once. Once you know the app list is there, the arrow now servers no purpose.