There are two types of people in the world: those who never use keyboard number pads, and those who can’t live without one. Going ‘tenkeyless’ means you have more room on your desk for a big mouse pad ...
You’re in the heat of the battle. Trying to get your circle-strafe on and take out the other guy before he realizes you’re there. And then thunk your mouse cracks into the right side of your keyboard.