I feel the same way. I worked at Microsoft on HoloLens and most the folks I knew there felt like Mixed Reality was modern marketing spin on AR. It makes sense from a marketing perspective since HoloLens was a very different beast than something like Google Glass, but I find the distinction needlessly confusing nowadays. To me, AR is just augmenting reality on a spectrum from 2D fixed overlay to depth-aware and beyond. I find naming arbitrary detents on the spectrum unproductive. The general public has enough confusion around VR vs AR, especially when pass-through enters the picture. To throw MR in the mix furthers the confusion.