Typically with split keyboards like this, you'd put the arrow keys on home row (or ijkl or esdf etc.), and access the arrow keys by holding a Fn key.

On a traditional keyboard, you can't access the arrow keys with your hands rested on home row. You have to move your hands to reach those keys.

Holding a Fn key brings more of the keyboard's functionality to within easy reach of the hands, at the cost that the keyboard is somewhat more complicated to use.

Good summary. I wouldn't buy one without obvious arrow keys however.