The hype train the caught me was VR. I'm reminded of the Microsoft Hololens. It was an incredible feat of engineering. At the same time, it was--at times, literally--a painful experience.

There was a vision of the Hololens being a general purpose compute device that enabled something more like the power of a desktop without being tethered to a sitting position at a desk. You could see it if you squinted hard (incidentally, the device caused a lot of eye strain). But even at the height of the VR hype cycle, I didn't know anyone pushing the Hololens on anyone. Nobody was telling the world they were going to be using Hololenses v1 or v2 as their only computer "or get left behind."