content: An HMD and smartphone aren't similar at all.  With an HMD floating screens can be any size you want, you can have dozens and thanks to satellite positioning they can be fixed so you could set up a playlist of videos for specific locations to give it a theme.  Most of you probably aren't old enough to know about drive-in movie theaters, those things were pretty awesome I got to experience it a few times when I was really young, with HMDs you can drive to a scenic location, set up a soundbar and recreate the drive-in experience. With smartphones you have a tiny 6 inch screen you have to carry, it's a pretty awful experience.   I'm just skipping out on smartphones mostly, waiting for the VR/AR era to fully commence.