It's not downgraded, that was never the game.
They already discussed this in detail, this was a proof of concept not really attached to anything, this was the peak of what could be done. They had to build an actual game out of this though, they had to leverage the amount of acceptable compute usage for the game to allocate from the cloud, they had to look at the scope of the world, what was in it and what kind of gametype could be formed from it. I mean as cool as this looks a bunch of obstructive rubble everywhere doesn't make for a fun game, it makes for a bunch of shit you're going to get stuck on, in and frustrated with.