Making one area look good is fine. Making those features work (or be useful) across multiple different areas and scenarios is more difficult.
what you clearly don't get is the fact that they're doing groundwork right now, and no special features for selected areas.
Making the water rise and fall for the waterfall isn't a special feature for that selected area? Pray tell, how much rising and falling water is planned for Eternity? Me hopes lots! It could be a recurrent theme. You could encounter fountains and make their water rise and fall, the water could rise and fall in bath houses as you take a dip, we could even have oceans where the water falls and you can walk across like Moses crossing the Red Sea! Then the water rises again so that all the chariots following them are flooded (this game will have chariots, right?).
They've spent a lot of time making one area look good. And sure, it looks great - and dynamic! But I'd sure love to see one of these other exteriors "they've worked on". Because at the moment, it seems like they spent two weeks dicking around with one relatively tiny area (the player will spend how much time running through here?) on a feature that will mostly be ignored by players in the final game. And if it takes two weeks (or even one week) to "nail" the specific "dynamic content" of each set piece, then they don't have time for a lot of areas.
Unless their pipeline is chock full of "rising and falling water" areas...