The reason this is useful is it helps stimulate the computer industry which realistically is stagnant. The biggest barrier to ARM based computers is realistically software. Windows on ARM makes ARM based computers more viable which is useful even if you don't use Windows. I am sure someone will figure out how to run Linux on these devices. The designs in question could be adapted to Linux use or at the very least Chrome os use. Even if you don't use Windows this is still good.

Having millions of computers be dependent upon components produced by only two companies (Intel and AMD) will stagnate the industry. If either company went bust (not likely, but maybe) it would become difficult to manufacture computers.