Do mechanical keyboards really need arrow keys?

Interesting idea showcased in this article from The Verge: an upcoming Angry Miao mechanical keyboard that adds a capacitive touchpad to use for arrow movement or other functions.

I use an ErgoDox EZ split keyboard that has no arrow keys. I find that placing the arrow keys on another layer works fine with practice. However, I still prefer to have arrow keys visible and easy to access. My preferred solution is to use a tiny SIXKEYBOARD placed to the left of my keyboard. The primary downside: this adds another cable to manage.