Head Mount setups - as you point correctly out - are required for a long-time VR consumption. But they come with caveats: - They make the devices heavier & bulkier. - You need a good mechanism to fastly switch back to use as a mobile phone (i.e. when you receive a phone call while in VR) - You need to make sure that the phone is tightly in place. If you move your head considerable force is applied to the casing.

Using your hand allows InstanTRIP Pad 02 to be tiny. It is folded together so tiny that you can put it in the back-pocket of jeans and forget you put it in there. Other VR boxes have to be carried in a bag and consume a lot of space in there.

Other head-mount-less "cardboxes" cost at least 20% more than InstanTRIP (for most you pay double the price) and the setup time is considerable.

There have been trade-off's made but I don't think that they are all bad (feel free to correct me)