I don't see you making jokes on people that have nothing for praise for the game (if you did, you'd have hundreds of posts in this thread). You clearly targetted someone who had something to say that wasn't just praise. That's console warring and your facade is wearing thing.
It's not about being realistic about walking on sand, is about creating the illusion that these entities do. You can see on the trailer that alloy does leave footprints on sand, but the robots don't. If you watch the segment where the raptor does the attack where it lifts up and "shouts" for lack of a better word, he's interacting with the shallow water but not with the sand.
This lack of fidelity will only be more and more noticeable moving forward as graphics get better. It's the nature of the beast, there's no more weirdly low-rex textures, no more noticeable polygons on sight to remind it's just a videogame, so every single thing that doesn't fit becomes more noticeable.