I think some people underestimate how limiting an additive-only display is, or how different that makes things look. So I went through the trouble of making a rough mock-up of how a couple frames of that video would look like if they were accurate.
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That doesn't look too bad, but certainly doesn't look the same, and it would take very little effort to present it this way. Any video editing software that allows you to overlay a piece of footage on top of another supports blending modes such as screen or add. To me though, making that mockup was harder since I didn't have the separate layers, I had to recreate the background behind the ships in photoshop and cut them out by hand.
Now look how bad those augmented cracks on the wall look, and how hard it is to see things under a very bright window:
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Doesn't look too hot eh? This is the kind of scenario in which additive only really shows its limitations. And it is dishonest, in my opinion, to hide those limitations, or pretend they aren't there. If the video said "this are the real time rendered augmentations" I wouldn't mind, but the video said "what I see" ( where I is the kid that represents an user ) which is misleading. I am also perfectly ok in cutting them slack for using the camera footage instead of actually filming from the exact POV of an user. I'm even ok with them cheating with the FOV a bit for demonstrational purposes. But pretending they can overlay dark objects over bright BGs just fine and have them look solid is not a tiny detail to me. Its a big and important limitation of the tech, and one you have to be honest about.
I would even say, I don't think the actual game uses those assets. Some of those alien ships are very dark, and might not display very well. You really need bright stuff on Holo Lens.
Additive only displays are not unusable though, there are lots of things you can do with them. You can create a very good Tron-like game with it, or a game about ghosts and spirits. You might not be able to overlay dark holes over your white wall, but you could create cracks to a bright alien second dimension, with fancy god-rays coming through it. You can even do a good enough job of faking solid non-see-through darkish realistic objects on darker environments. But you most definitely CAN'T acuratly display realistic solid objects over bright environments with Holo Lens's current additive only display technology. There are no two ways around that. I think this game is not playing to the tech's strengths, and is portraying the final result deceptively.