Because its available and better and this is being marketed as a premium device. Since you mentioned phones though I remember reading that 3.0 could enable fast

Because its available and better and this is being marketed as a premium device. Since you mentioned phones though I remember reading that 3.0 could enable faster charging than 2.0. Also, with the 1TB of cloud space, I would probably want to copy something off there from time to time and would like the faster speeds.