Their players are on another planet when compared to any streaming stick.
Perhaps, but you wouldn't have access to the higher quality images their mastering process affords.
If they did that, their end product wouldn't look any better than the disc. You are not just paying for the storage and convenience, you are also paying for access to content that has been mastered and optimized specifically for this platform. It does not have the bandwidth limitations like streaming or the disc, so they can encode images at a higher bitrate than both streaming and the disc. More bits and bandwidth dedicated to the images lead to fewer artifacts and less need for compression. On a small screen, this may not be that important. On a large screen with the right projector, it is necessary.