Trackpad is nice for a device you can lay flat on a table or keep on one hand while sitting on the sofa, not too much when the device has a keyboard permanently attached to it and it cannot fold. I know I have a thinkpad like that and I never use the touchscreen.
Two keys rather than one, but makes up for it by not being way off in some oddball part of the keyboard. You can one-hand it pretty easily, since there's an "option" right next to the arrow keys.