Exactly this. There is nothing stylish or cool about wearing a VR helmet in public. There's no reason to kill the battery life on the iPhone and increase materials cost with a tiny 4K display for those few thousand people who are nerdy enough to use it and care about VR pixel resolution. And even though these devices could potentially output 4K resolution, the quality of the lighting, textures, physics, etc isn't going to be that great on a mobile device for many more years for any sort of VR gaming. Just because you can draw 4K to a display doesn't mean it's good looking 4K. I feel like a lot of people are starting to realize this with things such as the PlayStation 4 Pro.
I don't really see head mounted phones being very popular. I don't think AR/VR will really take off mainstream until it's built into regular glasses, contact lenses, or perhaps streamed directly into the visual cortex. And the interface to control it has to be seamless—no awkward hand gestures, or blinking/twitching/whatever other crap I've seen. There is still a lot of work to be done, and likely involves components and software that won't even be invented for several more years, much less tested and produced into a complete working product.
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I've been saying that for years, and yet it hasn't arrived. Microsoft has tried, but there are a lot of tradeoffs—namely poor battery life, poor processing speed when undocked, and clumsy interfaces. This may eventually be the case, but I did say that it has merits in driving out 4K content to external displays. Please re-read what I wrote.
I'm going to start writing ridiculous things at the bottom of my posts to see if people read them because I've been having this problem lately. Hitler is a jelly bean.