Look at this scene:
See that darker section of sky on the right side. Th0se are dark clouds. Amazing! Why is it amazing? Because they’re not usually there!
I haven’t seen any other MMOs do weather change before. The sky is either always sunny, always white or always blue with clouds in it. In Vanguard, it seems they included a rudimentary weather system. The sky over the desert goes grey in certain areas, and it might even rain. The sound effects also change. Right now, it sounds like a storm approaches.
I like such tiny little details. No one might give a crap, but if you do notice them, it’s a cheerful little event.