> they tend to show off how tech will look 4-5 years down the line
Unity's tech demo "Adam" is now more than 5 years old and I still don't see any Unity games coming even remotely close to that. Unity's tech demos are just hoaxes: Carefully crafted demos with custom engine parts and basically hand-written stuff like shaders and controllers all over. The irony is that these demos are primarily aimed at developers, yet you can't take a single piece of those things and just make it work on your own setup. In contrast when it comes to Unreal it's usually just a Ctrl+C and Ctrl+V away from success ...
Unity games? No, not to my knowledge. But the industry has certainly gotten extremely close to realizing the tech being leveraged in Adam. Some may even argue that some UE5 showcases with real samples have succeeded it, despite this being a non-real time showcase.
I don't think this is because you can't just copy-paste an Adam asset into the Unity engine, however. AAA devs are going to leverage their own assets regardless.
I think that's more of an image problem than a "technologically possible" problem, however. Many of Unity's huge successes come from the indie side, the Ori's, the Hollow Knights, the Cupheads. And it has a very big grasp on the mobile market. Even Pokemon Go decided to use Unity despite the IP being backed by a publisher known for their in-house engines. so a AAA studio isn't thinking of Unity for their next Call of Duty, but maybe for their Call of Duty mobile title.
They seem to be trying to combat that sentiment with the likes of DOTS,HDRP, and whatever Ziva is trying to do, but those are still TBD.
IME they tend to show off how tech will look 4-5 years down the line, about the time a modern AAA game needs to from production to release.