I can't believe there are people who unironically believe they showed even 1% of the game and the possibilities with fusing stuff and building stuff with ultra hand.
The Switch OLED had something similar with idiots saying it's overpriced and unecessary and then it released and everyone stopped immediately.
Just to add to this BOTW was demonstrated in the same way with the E3 demo of the plateau, like here it really was to show off mechanics.
It's unrealistic to expect to see the large amount of emergent gameplay from a game with such freedom, the fuse ability alone is going to be massive as these are on top of prior game physics as well. For example the arrow demonstration and the shield, combine the arrow with the mushroom that was used on the shield and you can blind a group of enemies in your path to move pass unhindered or even as a distraction at an enemy camp. This one ability alone has increased the potential practical use of all the resources a player will come across.