It's a self described short film. Why would a short film have gameplay? That would make it a short game.
The burgers on the display panel in the fastfood store also always look so much better than the actual product you buy.
This criticism would be valid if this was prerendered but its real time.
i'm not even sure what it is supposed to be highlighting.
High visual fidelity rendered in real time. Also its showcasing a new real time area lighting technique they developed and volumetric lighting implementation. You can read more about it here: https://eheitzresearch.wordpress.com/415-2/
Also, a lot of unity tech while very nice isnt actually real time, the environment for example will use baked in shadows and ambient occlusion, these two things alone make any environment look hugely better than any real time alternatives.
If you take a close look at the video you'll realize that the majority of the impressive parts couldn't have been baked. Was the static environment in the beginning baked from the one directional light? Probably, though it didn't have to be. All those moving pieces can't be baked, so all the wires and cords coming out of him, all his motions, etc were all rendered in real time and it came out looking great. Him + the environment is also being lit by real time area lighting that was developed specifically for this project. As he walks down the hall those are real time reflections. When he gets outside theres now like 50 of him moving around, blowing grass, the guys with the guns etc. The only parts that could be baked there are the static environment.
The point is that they achieved prerendered visual fidelity without having to prerender it. Having ~10% of the lighting baked for insignificant static objects doesn't take anything away from this video.
The rest is doable in any other game engine you can get the models into.
I mean.. sort of? You could add the area lighting and other effects used to pretty much any engine you have source access to, but I think its inaccurate to state you could literally drop the models into any engine right now and recreate it. Not unless you allowed it to be prerended.
Not trying to imply this could only ever be done in Unity or that Unity is the greatest engine ever or anything. Just saying the engine and the team that made the video both deserve some credit. It came out very well.