In a workshop, safety goggles are already worn, so there's no extra discomfort in donning eyewear. Also, it's your damned workshop, so there's no privacy concerns to the public if you're wearing a head-mounted camera. Being able to measure dimensions on your workpiece on the fly, hands-free, whilst working with a CNC router work really ease the workflow. Plus, tape measures are a bugger for hiding, and I don't like having metal rulers near spinning blades.
However, goggles would be for niche use cases - this article is about placing environment-aware tech into millions of phones with initial indifference of most of the end users. Of course the sensor and silicon tech in phones and goggles has much in common.
When I've used CNC machines I've had to design on one computer and initiate the job from a dedicated control computer. There's scope for streamlining the whole process. It would be akin to the ease with which we can now send a photograph of something to a colleague on the spot with only a few taps, compared to the faff of only a dozen years ago where we would have return to a PC after taking a pic and swap the SD card over.
Heck, it would be bloody handy for the CNC router to have machine vision, so it can detect (and correct) if it's strayed from its zeroes or has broken its bit. There's already 3D printers which do this.