I partly understood it with the "first"-gen New MacBook; it was experimental, and they wanted to give it this kind of minimalist-mystique of flipping the naming

I partly understood it with the "first"-gen New MacBook; it was experimental, and they wanted to give it this kind of minimalist-mystique of flipping the naming convention where this forward-looking device was now simply "The MacBook". But why does it even still exist now that the other ones have adopted most of its features?