Daydream and Gear VR cannot do spatial VR (where your head moves left a few inches) which severely limits the immersiveness you can achieve. It's like watching a 360 video on the Vive or Rift. It's not a good feeling. You can look around but it's completely obvious that your head is not modeled in the world.

Unless they invent/integrate tech like Project Tango into most phones and make it work for spatial location this is not a problem that can really be solved on mobile.