It's a complete bloody mystery and I thought the same thing when I saw their other laptops. I'm sure their target audience uses the cursor keys more than almost every other key, and they've made them those horrible tiny nubs. You could literally fit all four of them into the footprint of that right shift key, the right shift key
that I have never even once pressed in 30 years of computing.
No matter what else they do, the arrow keys tell me they are fools who should not be trusted! (Hyperbole, sure, but only a little.)