You can keep your hands in typing position on the keyboard while performing these operations. Using the arrow keys or backspace means you need to move to another part of the keyboard which interrupts your flow.
Point taken, thank you. Though, trying it out now, I realised f,b,p,n are not quite next to each other, and funnily enough, while I can easily type without looking at the keyboard, when I use a modifier key, the muscle memory used for typing doesn't seem to help as much, it seems it needs new training. Seems I need to flex more :)