no really same sh** i do not see any befit for the player having unreal engine 4 or 5
i do not understand the fuss is all about

I suppose that new versions of any game engine are designed more for game developers, than for players, e.g. to give more possibilities for optimization of their work efforts.

Just for a couple of examples, see this:
https://www.youtube.com/watch?v=FUGqzE6Je5c

Epic as a company went down the drain but the engine itself is still top notch and easily one of the best out there, regularly breaking new ground.

Base Graphics already look "good" and havent changed much over the past 5 years, except of course for a higher polygon count and better viewing distance.
Visually the new engines are all about illumination and shadows and reflections for a more realistic look. Ironically the best selling games are supposed to look like cartoons and won't benefit at all from that.

They benefit more from new techniques when it comes to loading data into the memory. PS5 started it, the PC still has a hard time to get even in position even if the technology is there.
Standardized acces to this technology through engines like UE5 will definitly help.

same nonsense i seen decades ago

20 years ago i seen Nvdia demo's that are life like, games still aint that qaulity

15 years ago
https://www.youtube.com/watch?v=vS5tfq_Ctis

over 20 years ago
https://www.youtube.com/watch?v=zje-5TMe8nQ

Oh come now, they're both pretty basic; the 20 year old one in particular isn't really that impressive today (and understandably so - 20 years back it would have been). Dawn is basically an (admittedly decent) model on a very low rent background. It doesn't put anyway near as much pressure on the GPU as a modern game.

Nalu has impressive hair, but again, there's not much else going on in the demo. Personally, I think that the Witcher 3 looks better than either of these (and remember, that's rendering a full game environment, not just a single model)

UE5 is a decent engine as is UE4. The idea behind a new engine is to add new features in as standard and make it easier to develop. You can still use UE2 to make a really good looking game, but it's going to be easier on a new engine.

That's why we call them Demos. They show what's possible if you put all your effort into one character with hardly any background.
But when you have an open world with far viewing distance, 10 or 20 characters on the screen, each one with at least some basic AI (other than the purely scripted movements and you want to have the sun shining, water reflections, ambient occlusion, moving clouds and particle effects, then you can't afford as much details for one character.
If you only have one char, you can put a lot more work into facial animations as when you have 30 different char types to animate. And of course these demos are made and optimized for one system, don't have to run on consoles.

I played this demo on my card back then and it certainly was impressive, but already W2 surpasses many aspects of this demo, Ubisoft's open world games do the same. They do have bad character and especially facial animations.If you want to see good character details and lip sync (which this demo does not have at all), you play Detroit.
Switch it to wireframe mode and see how little details the body of the char really has (you can see that in the video on the arms. Witcher has a by far higher polygon count). The shadows compared to modern standards look quite bad and are very static. And this is while having only one single hand animated / scripted character.

Right now we still see mostly improved PS4 technology in our games, which is about half as old as this demo. The new generation stil has to take hold.

You're 100% correct on this. You did notice how janky the background was in that demo right? Or that in the underwater one, they ditched the background altogether? A lot of detail and processing power goes into a decent looking backdrop.

Anyway:

https://za.ign.com/the-witcher-3/171056/gallery/witcher-3-next-gen-update-screenshot-gallery?p=1

Or - a different game, still looking better than either of those two demos:

https://www.nvidia.com/en-us/geforce/news/death-stranding-pc-virtual-photography/

Two other things you aren't taking account of:

- With a tech demo, you can basically fake it; set a number of scenarios and animate each of them. Limited user intervention makes things really easy

- With games you tend to not stop and look at model detail etc because you're playing the game. Generally, they focus resources on things you're more likely to notice

Oh - also, the New Dawn demo was only 10 years ago.