Still waiting for the time when a developer says "oops sry, we didn't know much so that our end result looks much better as what we could show you years ago"

Now that would be nice.

Which is going to very rarely happen because as developers add to a game, they have to juggle resources more and more.  That's why tech demos will always look better than games.

Personally, I'll take cutting visual back a bit if it means a better game, any day of the week.

Sure I also prefer that but I still believe that at least some devs simply want to impress people and get their attention and that it's not always only because they add other stuff that the final game will look worse. 

But that's like in every industry where a company tries to let their product look better as it will be. And if it is only about a vacuum cleaner.

Too early to show how good it was supposed to be instead of the downgraded shit we have today? Man, how technology is now moving backwards instead of forwards eh?

That's something that should happen more often. I feel like developers spend way too much time on graphics in the early stages of development when what they really should do is create a game that's smooth and great to play and then spend whatever time they have left polishing the graphics. If a game with placeholder graphics is fun to play it'll most certainly be fun to play once the finalised assets are added. A game with good-looking graphics but less than satisfying gameplay and level design won't be much better with a few polygons added here and there, and a game with great graphics but less than satisfying gameplay and level design that later on gets a graphical downgrade because the developers overestimated how much they could push the visuals has a good chance of becoming a disaster.

Sadly, today's climate pretty much forces developers to put a big focus on graphics from the very start to satisfy a crowd that expects an unfinished product to look just as good as a finished one. Just look at the meltdowns caused by Super Mario 3D World's initial reveal.

Not gonna predict doom and gloom here but if companies continues down the road of showing of games that aren't ready to be revealed yet it could easily turn into a bad circle.